If a and b are positive integers : GMAT Data Sufficiency (DS)
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# If a and b are positive integers

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Senior Manager
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If a and b are positive integers [#permalink]

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13 Oct 2012, 17:18
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35% (medium)

Question Stats:

63% (01:21) correct 37% (00:42) wrong based on 41 sessions

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If a and b are positive integers, is a/b an even integer?

1. ab is an even integer
2. b/a is an even integer
[Reveal] Spoiler: OA
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Re: If a and b are positive integers [#permalink]

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13 Oct 2012, 18:12
Shawshank wrote:
If a and b are positive integers, is a/b an even integer?

1. ab is an even integer
2. b/a is an even integer

1. ab is an even integer - we've 3 options -
a = even & b = even
a = odd & b = even
a = even & b = odd
Can't conclude that a/b is an even integer or not. Insuff.

2. b/a is an even integer - this means that B is greater than a and the value is one among 0, 2, 4, 6 etc.
However, the reverse of these numbers are 1/2,1/4,1/6,1/8 etc, and we know that these numbers are not even.
Sufficient.

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Re: If a and b are positive integers [#permalink]

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14 Oct 2012, 00:51
Shawshank wrote:
If a and b are positive integers, is a/b an even integer?

1. ab is an even integer
2. b/a is an even integer

m19 q31

If a and b are positive integers, is a/b an even integer?

(1) ab is an even integer. If $$a=b=2$$ then the answer is NO but if $$a=2$$ and $$b=1$$ then the answer is YES. Not sufficient.

(2) b/a is an even integer --> $$\frac{b}{a}=even$$ --> $$\frac{a}{b}=\frac{1}{even}\neq{integer}$$, so $$\frac{a}{b}\neq{even}$$. Sufficient.

Hope it's clear.
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Re: If a and b are positive integers   [#permalink] 14 Oct 2012, 00:51
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