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# 100 Hardest and easiest questions for DS as of December 2019

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Math Expert
Joined: 02 Sep 2009
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100 Hardest and easiest questions for DS  [#permalink]

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Updated on: 01 Jan 2020, 05:45
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382

100 Hardest Data Sufficiency Questions (Dec 1st, 2019 - Jan 1st, 2020)

Are you familiar with the GMAT Club's timer?We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the hardest questions in each of the question forums we have. Below I am presenting to you the top 100 questions from DS forum.

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Originally posted by Bunuel on 21 Aug 2015, 03:42.
Last edited by Bunuel on 01 Jan 2020, 05:45, edited 1 time in total.
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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Updated on: 01 Jan 2020, 05:45
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100 Easiest Data Sufficiency Questions (Dec 1st, 2019 - Jan 1st, 2020)

Are you familiar with the GMAT Club's timer?We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the easiest questions in each of the question forums we have. Below I am presenting to you the top 100 questions from DS forum.
 Data Sufficiency (DS) Rank Title Topics 1 If a certain vase contains only roses and tulips, how many tulips are Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 2 What is the value of 10 percent of y? Difficulty: Sub-600 Level, Percent and Interest Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 3 What is the number of pages of a certain journal article? The size of Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 4 In a recent town election, what was the ratio of the number of votes Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 5 What is the value of x ? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2nd 6 In College X the number of students enrolled in both a Difficulty: Sub-600 Level, Overlapping Sets, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12 7 How many basic units of currency X are equivalent to 250 basi Difficulty: Sub-600 Level, Arithmetic, Source: Official Guide, Source: OG 2020, Source: OG 2019 8 For which type of investment, J or K, is the annual rate of Difficulty: Sub-600 Level, Percent and Interest Problems, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 2015, Source: OG 12 9 What was the median annual salary for the employees at Compan Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 10 The symbol R represents one of the following Difficulty: Sub-600 Level, Arithmetic, Functions and Custom Characters, Source: GMAT Hacks 11 If p and q are positive, is p/q less than 1? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 12 The research funds of a certain company were divided among three depar Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 13 If sequence S has 120 terms, what is the 105th term of S? Difficulty: Sub-600 Level, Sequences, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 14 If sequence S has 100 terms, what is the 83rd term of S? Difficulty: Sub-600 Level, Sequences, Source: Other - Please specify 15 What is the value of x ? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 16 Is x = 1/y? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 17 What is the tenths digit of the number d when it is written as a...... Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Source: Official Guide, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 18 What is the value of n? Difficulty: Sub-600 Level, Number Properties, Source: GMAT Prep 19 The figure above represents a circle graph of Company H's total expens Difficulty: Sub-600 Level, Geometry, Graphs and Illustrations, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 20 What is the value of w^(−2)? Difficulty: Sub-600 Level, Exponents/Powers, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 21 If r and s are positive integers, is r + s even? Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2020 22 If p, q, x, y, and z are different positive integers, which Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 23 What is the value of xy? Difficulty: Sub-600 Level, Algebra, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 24 Each of the marbles in a jar is either red or white or blue. If one ma Difficulty: Sub-600 Level, Probability, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 25 In the xy-plane above, is angle QPR a right angle? Difficulty: Sub-600 Level, Coordinate Geometry, Geometry, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 26 Is p^2 an odd integer? Difficulty: Sub-600 Level, Number Properties, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 27 Carlotta can drive from her home to her office by one of two Difficulty: Sub-600 Level, Distance/Rate Problems, Source: Official Guide, Source: OG 12, Source: OG 11, Source: OG 10 28 What is the perimeter of triangle ABC ? (1) AB = 16 inches (2) ABC is Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020 29 What is 11% of x? (1) 3/8 of x is 24 (2) 5% of x is 3.2 Difficulty: Sub-600 Level, Arithmetic, Percent and Interest Problems, Source: Manhattan GMAT 30 How many of the students in a certain class are taking both a history Difficulty: Sub-600 Level, Number Properties, Word Problems, Source: GMAT Prep 31 What is the value of r/2 + s/2 ? Difficulty: Sub-600 Level, Algebra, Arithmetic, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 32 A company bought 3 printers and 1 scanner. What was the price of the Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 33 Committee member W wants to schedule a one-hour meeting on T Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 34 Is rw = 0? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 35 Is x between 0 and 1? (1) x is between -1/2 and 3/2 (2) 3/4 is 1/4 Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep, Source: Quant Review 2020, Source: Quant Review 2019 36 Hoses X and Y simultaneously fill an empty swimming pool tha Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2nd, Source: Quant Review 1st 37 Is 2x > 2y ? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 38 What is the value of n in the list above? Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 39 Is x < y? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2nd 40 What is the retail price of a certain calculator? (1) The retail pri Difficulty: Sub-600 Level, Arithmetic, Source: Manhattan GMAT 41 Machine R and machine S work at their respective constant rates. How Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 42 Does 2x + 8 = 12 ? (1) 2x + 10 = 14 (2) 3x + 8 = 14 Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019 43 How many men are in a certain company's vanpool program? Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 44 If sequence S has 200 terms, what is the 192nd term of S Difficulty: Sub-600 Level, Sequences, Source: OG 12 45 How many people in a group of 50 own neither a fax machine nor a laser Difficulty: Sub-600 Level, Overlapping Sets, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 46 Is x < y? (1) z < y (2) z < x Difficulty: Sub-600 Level, Inequalities, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 1st 47 If n is an integer, is n + 1 odd? Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 48 For the system of equations given, what is the value of z? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11 49 What is the product of v, w, and x? Difficulty: Sub-600 Level, Number Properties 50 For all x, the expression x* is defined to be ax + a, where a is...... Difficulty: Sub-600 Level, Functions and Custom Characters, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 51 In a certain class, some students donated cans of food to a local food Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 52 A circular pizza is cut into eight wedge-shaped slices of equal size. Difficulty: Sub-600 Level, Geometry, Source: Manhattan GMAT 53 In the terminating decimal equivalent of d, what is the number of nonz Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Number Properties, Source: Other - Please specify 54 What is the greatest integer that is less than t? Difficulty: Sub-600 Level, Number Properties, Source: GMAT Prep 55 If the Longfellow Playground is rectangular, what is its width? Difficulty: Sub-600 Level, Geometry, Source: Official Guide [Pre-2000], Source: OG 1988 56 If knz≠0, what is the ratio of k to n? 1) The ratio of k to z is 2 to Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Source: Math Revolution 57 Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2) Difficulty: Sub-600 Level, Algebra, Number Properties, Source: Official Guide, Source: OG 2020 58 A garden store purchased a number of shovels and a number of rakes. If Difficulty: Sub-600 Level, Word Problems, Source: GMAT Prep 59 What is the value of w + q ? (1) 3w=3-3q (2) 5w +5q = 5 Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 60 The number of seats in the first row of an auditorium is 18 Difficulty: Sub-600 Level, Sequences, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 61 In the figure above, segments PQ and PR are each parallel to one of th Difficulty: Sub-600 Level, Coordinate Geometry, Source: GMAT Prep 62 What is the value of x^3? Difficulty: Sub-600 Level, Absolute Values/Modulus, Algebra, Source: Veritas Prep 63 The cost of 10 pounds of apples and 2 pounds of grapes was \$1 Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019 64 Square ABCD is inscribed in circle O. What is the area of square regio Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 65 Is the integer p even? (1) The integer p^2 + 1 is odd. (2) The integer Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019 66 P is a particle on the circle shown above. What is the length of the p Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020 67 If x is positive, what is the value of y ? Difficulty: Sub-600 Level, Algebra, Source: GMAT Prep 68 If R, S, and T are points on a line, and if R is 5 meters from T and 2 Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020 69 On a map, 1/2 inch represents 100 miles. According to this map, how ma Difficulty: Sub-600 Level, Arithmetic, Source: Official Guide, Source: OG 2020 70 What is the volume of the cube above? Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 71 What is the value of x−1? Difficulty: Sub-600 Level, Algebra, Source: Official Guide [Pre-2000], Source: OG 1988, Source: Other - Please specify 72 Was the amount of John's heating bill for February greater than it was Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 73 What was the range of the selling prices of the 30 wallets sold by a Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 74 What is the volume of a certain cube? Difficulty: Sub-600 Level, Geometry, Source: GMAT Prep 75 Point (x, y) has in which quadrant of the rectangular coordinate syste Difficulty: Sub-600 Level, Coordinate Geometry, Source: GMAT Paper Tests, Source: Magoosh, Source: OG 10, Source: Quant Review 1st 76 What is the value of ab + bc ? (1) b = 5 (2) a + c = 8 Difficulty: Sub-600 Level, Algebra, Source: Grockit 77 In the figure above, what is the value of z? Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017 78 Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 Difficulty: Sub-600 Level, Algebra, Source: GMAT Paper Tests 79 What is the value of the integer N? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 80 Bob purchased 18 cans of soda, some of which contained diet soda. How Difficulty: Sub-600 Level, Word Problems, Source: Princeton Review 81 What is the value of z in the triangle above? Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11, Source: OG 10 82 What is the value of t? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017 83 P is a particle on the circle shown above. What is the length of the p Difficulty: Sub-600 Level, Geometry, Source: Official Guide [Pre-2000] 84 What is the average distance that automobile D travels on one full tan Difficulty: Sub-600 Level, Algebra, Word Problems, Source: Official Guide [Pre-2000], Source: OG 1988 85 What was Bill's average speed on his trip of 250 miles from New York Difficulty: Sub-600 Level, Distance/Rate Problems, Source: Manhattan GMAT 86 If u, v, and w are integers, is u > 0 ? Difficulty: Sub-600 Level, Algebra, Source: GMAT Prep 87 What is the value of x? (1) |x| = 4. (2) x^2 = 16. Difficulty: Sub-600 Level, Absolute Values/Modulus, Algebra, Source: Princeton Review 88 What is the value of xy ? Difficulty: Sub-600 Level, Algebra, Source: GMAT Hacks 89 What is the value of x? (1) 5x - 3 = 7 (2) x/10 = 1/5 Difficulty: Sub-600 Level, Algebra, Source: Official Guide [Pre-2000], Source: OG 1988 90 What were the gross revenues from ticket sales for a certain Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 91 Water is pumped into a partially filled tank at a constant Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 92 If a + b + c = 12, what is the value of b? (1) a + b = 8 (2) b + c = 6 Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019 93 If x and y are integers, what is the value of y ? Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 10, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st 94 If a school district paid a total of \$35 per desk for x desks and a to Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020 95 If x and y are integers, what is the value of x+y? Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep 96 If machine X ran continuously at a uniform rate to fill Difficulty: Sub-600 Level, Work/Rate Problems 97 Is m > k? (1) 3m > 3k (2) 2m > 2k Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep 98 Is x a negative number? Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11, Source: OG 10 99 Q is a cube. Find the volume of the cube. Difficulty: Sub-600 Level, Geometry, Source: Magoosh 100 Is w + h^4 positive? (1) h is positive (2) w is positive Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017

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Originally posted by Bunuel on 21 Aug 2015, 03:43.
Last edited by Bunuel on 01 Jan 2020, 05:45, edited 1 time in total.
##### General Discussion
Math Expert
Joined: 02 Sep 2009
Posts: 60480
Re: 100 Hardest and easiest questions for DS  [#permalink]

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21 Aug 2015, 05:20
5
1
Older version of this topic with 100 hardest questions is HERE.
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Concentration: Strategy, Technology
Re: 100 Hardest and easiest questions for DS  [#permalink]

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07 Dec 2015, 09:09
1
1
is there a dump of all these questions rather than click each link?
Intern
Joined: 12 Sep 2016
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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09 Jun 2017, 07:33
2
1
is there a dump of all these questions rather than click each link?
Bunuel IF not can you please make one as Its very time consuming due to technical problem
thanks!!
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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29 Jun 2017, 21:33
2
This is very helpful. Thank you very much for your efforts. You are doing a great service to those who aspire to ace GMAT. Keep up the good work.

Posted from my mobile device
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Joined: 31 Dec 2012
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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29 Jun 2017, 21:57
Thanks Buñuel for your efforts.[WHITE SMILING FACE]

Sent from my Moto G Play using GMAT Club Forum mobile app
Intern
Joined: 07 Dec 2016
Posts: 38
100 Hardest and easiest questions for DS  [#permalink]

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24 Aug 2017, 21:55
Hi Bunuel ,

Thanks for the sharing the list of questions.

Do we anywhere have the option to download all the questions in one go or we have to access them separately only.

Thanks!
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Joined: 02 Sep 2009
Posts: 60480
Re: 100 Hardest and easiest questions for DS  [#permalink]

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24 Aug 2017, 21:58
1
2201neha wrote:
Hi Bunuel ,

Thanks for the sharing the list of questions.

Do we anywhere have the option to download all the questions in one go or we have to access them separately only.

Thanks!

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Joined: 29 Jan 2018
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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29 Jan 2018, 23:02
Hi Bunuel
This is extremely helpful, many thanks
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Joined: 30 May 2018
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Re: 100 Hardest and easiest questions for DS  [#permalink]

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30 May 2018, 09:57
answer choices are not showing. Could anyone let me know to view the answers.
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Posts: 60480
Re: 100 Hardest and easiest questions for DS  [#permalink]

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30 May 2018, 22:47
1
SoloKOW wrote:
answer choices are not showing. Could anyone let me know to view the answers.

Click Spoiler: OA in the first post of a topic to check the official answer.
Attachments

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Re: 100 Hardest and easiest questions for DS as of August 2019  [#permalink]

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02 Sep 2019, 20:59
chondro48 wrote:
Bunuel,

Can any question in the Hardest Data Sufficiency Questions as of August 2019 appear in the same list as of July 2019, or earlier month and year?

Thanks for clarifying.

Posted from my mobile device

Yes. Even though the list is updated once a month, many questions in top remain the same.
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100 Hardest and easiest questions for DS as of August 2019  [#permalink]

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04 Sep 2019, 17:59
Hi bb

Is there any way for a user to search questions by the level of difficulty (e.g. 85% above) in this forum? I know the difficulty level is generated by an unofficial algorithm, but I feel that the computed level is pretty much reliable indicator.
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Re: 100 Hardest and easiest questions for DS as of August 2019  [#permalink]

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05 Sep 2019, 03:06
chondro48 wrote:
Hi bb

Is there any way for a user to search questions by the level of difficulty (e.g. 85% above) in this forum? I know the difficulty level is generated by an unofficial algorithm, but I feel that the computed level is pretty much reliable indicator.

There are 3 difficulties that are available for search. That’s how the system works - hard, medium, and easy.

https://gmatclub.com/forum/search.php?view=search_tags

Posted from my mobile device
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Re: 100 Hardest and easiest questions for DS as of August 2019   [#permalink] 05 Sep 2019, 03:06
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