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M04-28

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M04-28 [#permalink]

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New post 15 Sep 2014, 23:23
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10 applicants are interviewed for a position. Among them are Paul and Jen. If a randomly chosen applicant is invited to interview first, what is the probability to have neither Paul nor Jen at the first interview?

A. \(\frac{1}{10}\)
B. \(\frac{1}{9}\)
C. \(\frac{1}{2}\)
D. \(\frac{4}{5}\)
E. \(\frac{9}{10}\)
[Reveal] Spoiler: OA

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New post 15 Sep 2014, 23:23
Official Solution:

10 applicants are interviewed for a position. Among them are Paul and Jen. If a randomly chosen applicant is invited to interview first, what is the probability to have neither Paul nor Jen at the first interview?

A. \(\frac{1}{10}\)
B. \(\frac{1}{9}\)
C. \(\frac{1}{2}\)
D. \(\frac{4}{5}\)
E. \(\frac{9}{10}\)

Probability of inviting Paul or Jen first is \(0.1+0.1=0.2\); probability of inviting neither first is \(1- 0.2 = 0.8=\frac{4}{5}\)

Answer: D
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: M04-28 [#permalink]

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New post 30 Jun 2017, 22:29
"OR" type problem again.

Selecting Paul for interview = 1/10
Selecting Jena for interview = 1/10

"OR" means addition, so , (1/10) + (1/10) = 2/10

Not getting selected is 1-(2/10)= 8/10 or 4/5

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Re: M04-28 [#permalink]

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New post 07 Sep 2017, 02:09
Hello!

I have a question in this. Is there a possibility of GMAT testing this trap - I mean, not giving choices in their reduced form? Here the answer is 4/5 but choice is 8/10 (Which of course is one and the same). Though I got this right, It took me time to realize that the right answer choice is not in reduced form.

I read in some prep book that GMAT always gives answer choices in the reduced form. So, curious to know about this. Do not want to fall for this again :-(

Thanks!
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Re: M04-28 [#permalink]

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New post 07 Sep 2017, 02:13
susheelh wrote:
Hello!

I have a question in this. Is there a possibility of GMAT testing this trap - I mean, not giving choices in their reduced form? Here the answer is 4/5 but choice is 8/10 (Which of course is one and the same). Though I got this right, It took me time to realize that the right answer choice is not in reduced form.

I read in some prep book that GMAT always gives answer choices in the reduced form. So, curious to know about this. Do not want to fall for this again :-(

Thanks!


I would not call this a trap but yes, the options will be in reduced form. Edited.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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Kudos [?]: 135427 [0], given: 12694

Re: M04-28   [#permalink] 07 Sep 2017, 02:13
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