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If 7 < m < 11 and −2 < n < 5, then which of the following expresses th

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If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 19 Apr 2017, 12:53
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If 7 < m < 11 and −2 < n < 5, then which of the following expresses the possible values of mn ?

A. −14 < mn < 35
B. −14 < mn < 55
C. −22 < mn < 35
D. −22 < mn < 55
E. 5 < mn < 16

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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 03 Dec 2017, 21:07
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Hi All,

In these types of questions, there's often a fairly easy 'brute force' approach to getting the correct answer - multiply together every pair of values at the 'extremes' of the ranges and choose the least and greatest of that list.

Here, we're told that 7 < M < 11 and -2 < N < 5. The 'extreme' values of (M)(N) would be...

(7)(-2) = -14
(7)(5) = 35
(11)(-2) = -22
(11)(5) = 55

Thus, the range of (M)(N) would be -22 < (M)(N) < 55

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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 19 Apr 2017, 12:56
SajjadAhmad wrote:
If 7 < m < 11 and −2 < n < 5, then which of the following expresses the possible values of mn ?

A. −14 < mn < 35
B. −14 < mn < 55
C. −22 < mn < 35
D. −22 < mn < 55
E. 5 < mn < 16


Similar question to practice: https://gmatclub.com/forum/if-2-x-9-and ... 31608.html
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If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 19 Apr 2017, 15:35
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To find range of product mn, minimize lowest product and maximize highest product.

Here, to minimize, take the negative value of n and multiply by the higher positive value of m:

-2 * 11 = -22

To maximize, take the higher positive value of m, and the positive value of n:

11 * 5 = 55

Hence -22 < mn < 55

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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 29 Apr 2018, 08:42
SajjadAhmad wrote:
If 7 < m < 11 and −2 < n < 5, then which of the following expresses the possible values of mn ?

A. −14 < mn < 35
B. −14 < mn < 55
C. −22 < mn < 35
D. −22 < mn < 55
E. 5 < mn < 16



The spoiler is : D. −22 < mn < 55

But to me : 7(-2) < m*n <11*5 or -14 < mn < 55 ..... and thus the ans is B

SajjadAhmad , Bunuel or any Experts ... Pls confirm
It would also be great to edit the OA , incase its wrong
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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 29 Apr 2018, 09:06
u1983 wrote:
SajjadAhmad wrote:
If 7 < m < 11 and −2 < n < 5, then which of the following expresses the possible values of mn ?

A. −14 < mn < 35
B. −14 < mn < 55
C. −22 < mn < 35
D. −22 < mn < 55
E. 5 < mn < 16



The spoiler is : D. −22 < mn < 55

But to me : 7(-2) < m*n <11*5 or -14 < mn < 55 ..... and thus the ans is B

SajjadAhmad , Bunuel or any Experts ... Pls confirm
It would also be great to edit the OA , incase its wrong


Please read the thread:
https://gmatclub.com/forum/if-7-m-11-an ... l#p1839464
https://gmatclub.com/forum/if-7-m-11-an ... l#p1972493

Hope it helps.
_________________

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.


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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th  [#permalink]

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New post 29 Apr 2018, 09:22
Bunuel wrote:
u1983 wrote:
SajjadAhmad wrote:
If 7 < m < 11 and −2 < n < 5, then which of the following expresses the possible values of mn ?

A. −14 < mn < 35
B. −14 < mn < 55
C. −22 < mn < 35
D. −22 < mn < 55
E. 5 < mn < 16



The spoiler is : D. −22 < mn < 55

But to me : 7(-2) < m*n <11*5 or -14 < mn < 55 ..... and thus the ans is B

SajjadAhmad , Bunuel or any Experts ... Pls confirm
It would also be great to edit the OA , incase its wrong


Please read the thread:
https://gmatclub.com/forum/if-7-m-11-an ... l#p1839464
https://gmatclub.com/forum/if-7-m-11-an ... l#p1972493

Hope it helps.



Thanks a bunch ..... Got the mistake... should have been more careful.... Thanks again
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Re: If 7 < m < 11 and −2 < n < 5, then which of the following expresses th &nbs [#permalink] 29 Apr 2018, 09:22
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