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If k is an integer and 2 < k < 7, for how many different

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If k is an integer and 2 < k < 7, for how many different [#permalink] New post 09 Jul 2012, 02:34
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If k is an integer and 2 < k < 7, for how many different values of k is there a triangle with sides of lengths 2, 7, and k?

(A) one
(B) two
(C) three
(D) four
(E) five

Diagnostic Test
Question: 19
Page: 22
Difficulty: 600
[Reveal] Spoiler: OA

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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 09 Jul 2012, 03:37
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If k is an integer and 2 < k < 7, for how many different values of k is there a triangle with sides of lengths 2, 7, and k?

(A) one
(B) two
(C) three
(D) four
(E) five

Diagnostic Test
Question: 19
Page: 22
Difficulty: 650


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Believe ans is A as k can be 3,4,5 or 6. for all cases except k=6, sum of teo sides can be less than equal to third side which should not be true

As as per triangle property sum of two sides is greater than third side.
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 09 Jul 2012, 05:20
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Bunuel wrote:
If k is an integer and 2 < k < 7, for how many different values of k is there a triangle with sides of lengths 2, 7, and k?

(A) one
(B) two
(C) three
(D) four
(E) five

Hi,

Difficulty level: 600

|7-2| < k < |7+2|
or 5 < k < 9
thus k = 6, 7, 8, but 2 < k < 7
therefore, k = 6

Answer (A),

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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 13 Jul 2012, 01:59
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SOLUTION

If k is an integer and 2 < k < 7, for how many different values of k is there a triangle with sides of lengths 2, 7, and k?

(A) one
(B) two
(C) three
(D) four
(E) five

Relationship of the Sides of a Triangle: The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.

According to the above the following must be true: (7-2)<k<(7+2) --> 5<k<9. So, k could be 6, 7 or 8. Since also given that 2 < k < 7, then k=6. Hence k can take only one value: 6.

Answer: A.
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 25 Nov 2012, 13:50
Why is it only one value?
What if 2 is the smallest side and 7 is the largest? Then, k can be 6, 7 or 8. since:

2 + 7 = 9
7 - 2 = 5
So 5 < k < 9

The problem does not specify that 2 and 7are the smaller two sides.

Last edited by morfin on 26 Nov 2012, 09:05, edited 1 time in total.
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 26 Nov 2012, 01:05
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morfin wrote:
What if 2 is the smallest side and 7 is the largest? Then, the answer is B (two) since:

2 + 7 = 9
7 - 2 = 6
So 6 < k < 9

The problem does not specify that 2 and 7are the smaller two sides.


Not sure I understand your question.

First of all: 7-2=5, not 6.

Next, obviously since the lengths of the sides are 2, 7 and k, where 2<k<7, then the length of the smallest side is 2 and the length of the largest side is 7. Check here for complete solution: if-k-is-an-integer-and-2-k-7-for-how-many-different-135543.html#p1104032
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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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.


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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 19 May 2014, 22:39
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Hi Bunuel, 39% got it wrong. Do u wanna tag it 600-700 instead of sub600? thanks
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 19 May 2014, 22:43
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 19 May 2014, 22:49
Bunuel wrote:
MensaNumber wrote:
Hi Bunuel, 39% got it wrong. Do u wanna tag it 600-700 instead of sub600? thanks

____________
Done. Thank you.


Great ! Thanks for a quick reply.
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Re: If k is an integer and 2 < k < 7, for how many different [#permalink] New post 20 May 2014, 03:17
Relationship of the Sides of a Triangle: The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.

Above relationship is in the core of this solution. Many times I have found students having difficulty is assimilating this concept.

Best way to get this concept is trying to actually draw triangles which contradict this. For example, try to draw a triangle with following sides (actual scale)

4, 3, 8

Once you failed, you will realize that The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.
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Re: If k is an integer and 2 < k < 7, for how many different   [#permalink] 20 May 2014, 03:17
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