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# If a and b are integers, and m is an even integer, is ab/4

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Manager
Joined: 05 Nov 2012
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If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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19 Dec 2012, 23:45
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Difficulty:

65% (hard)

Question Stats:

57% (01:54) correct 43% (01:53) wrong based on 130 sessions

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If a and b are integers, and m is an even integer, is ab/4 an integer?

(1) a+b is even.

(2) m/(ab) is an odd integer.

Source: HULT
[Reveal] Spoiler: OA

Kudos [?]: 40 [0], given: 57

VP
Joined: 02 Jul 2012
Posts: 1216

Kudos [?]: 1663 [1], given: 116

Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Re: If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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20 Dec 2012, 00:33
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Amateur wrote:
If a and b are integers, and m is an even integer, is ab/4 an integer?

(1) a+b is even.

(2) m/(ab) is an odd integer.

Source: HULT

1) Obviously Insufficient. If a+b =2, answer is no, If a+b = 4, answer is yes. We have no info about ab.

2) We are given ab is even. If ab =2, answer is no, if ab=4, answer is yes. Insufficient.

1 & 2 together, ab is even and a+b is even. So, a & b have to be even. Product of two even numbers is always divisible by 4.

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Kudos [?]: 1663 [1], given: 116

Director
Joined: 25 Apr 2012
Posts: 724

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Re: If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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20 Dec 2012, 00:34
Amateur wrote:
If a and b are integers, and m is an even integer, is ab/4 an integer?

(1) a+b is even.

(2) m/(ab) is an odd integer.

Source: HULT

Hi,

Question basically asks if ab is a multiple of 4 or not

From St 1, a is even, b is even or a is odd, b is odd. So not sufficient alone

From St 2 we get that m is even integer and m/ab is odd integer. Therefore we can say that m is odd multiple of ab and ab is even integer.

Therefore there will be 3 cases

1. a is even, b is even and thus ab is even
2. a is odd, b is even and thus ab is even
3. a is even, b is odd and thus ab is even

Thus st2 alone is not sufficient

Combining both statements we get a+b is even and ab is even. For both these conditions to be true a, b have to be even and hence ans should be C
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Last edited by WoundedTiger on 16 Jan 2014, 03:25, edited 1 time in total.

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Re: If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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20 Dec 2012, 02:29
If a and b are integers, and m is an even integer, is ab/4 an integer?

(1) a+b is even. This implies that either both a and b are odd or both even. Now, if a=b=1 the answer is NO but if a=b=2 the answer is YES. Not sufficient.

(2) m/(ab) is an odd integer. Since given that m=even, then we have that $$\frac{even}{ab}=odd$$ --> $$ab*odd=even$$ --> $$ab=even$$ --> at least one of the unknowns is even. Not sufficient.

(1)+(2) Since from (2) we have that at least one from a and b is even then from (1) it follows that both a and b must be even. The product of two even numbers is divisible by 4. Sufficient.

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Re: If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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30 Sep 2014, 12:56
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Re: If a and b are integers, and m is an even integer, is ab/4 [#permalink]

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07 Oct 2016, 03:38
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If a and b are integers, and m is an even integer, is ab/4   [#permalink] 07 Oct 2016, 03:38
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