If A and B are positive integers, is the product AB even? : GMAT Data Sufficiency (DS)
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# If A and B are positive integers, is the product AB even?

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If A and B are positive integers, is the product AB even? [#permalink]

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03 Sep 2012, 05:06
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If A and B are positive integers, is the product AB even?

(1) The sum A + B is odd.
(2) A is even.

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Question: 32
Page: 277
Difficulty: 550
[Reveal] Spoiler: OA

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Re: If A and B are positive integers, is the product AB even? [#permalink]

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03 Sep 2012, 05:06
SOLUTION

If A and B are positive integers, is the product AB even?

Since A and B are integers, then in order the product AB to be even at least one of them must be even.

(1) The sum A + B is odd. A and B cannot both be odd, since odd+odd=even, so either A or B must be even. Sufficient.

(2) A is even. Sufficient.

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Re: If A and B are positive integers, is the product AB even? [#permalink]

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03 Sep 2012, 05:13
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If A and B are positive integers, is the product AB even?

(1) The sum A + B is odd.
(2) A is even.

Stat1:
Since A+B = odd implies that one number is even and other is odd so product of AB will be even in any case.

Stat2
A is even.
Since A is even and B is any positive integer so AB will be even in any case.

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Re: If A and B are positive integers, is the product AB even? [#permalink]

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07 Sep 2012, 04:36
SOLUTION

If A and B are positive integers, is the product AB even?

Since A and B are integers, then in order the product AB to be even at least one of them must be even.

(1) The sum A + B is odd. A and B cannot both be odd, since odd+odd=even, so either A or B must be even. Sufficient.

(2) A is even. Sufficient.

Kudos points given to everyone with correct solution. Let me know if I missed someone.
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Re: If A and B are positive integers, is the product AB even? [#permalink]

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26 Jun 2014, 19:17
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Re: If A and B are positive integers, is the product AB even? [#permalink]

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19 Jun 2015, 17:57
A, B= Positive Integers

Is AB=Even? Rephrase question to Is either A or B Even?
Y/N question.

I started with statement 2.
A= Even= Sufficient. Anything times an even number=a even number

Statement1
A+B=ODD
only ODD+Even=ODD therefore sufficient
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Re: If A and B are positive integers, is the product AB even? [#permalink]

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09 Aug 2016, 12:44
Quote:
If A and B are positive integers, is the product AB even?

(1) The sum A + B is odd.
(2) A is even.

We need to determine whether the product of positive integers AB is even. We must recall that the product of an even integer and any other integer is always even. Thus, if we can determine that either A or B (or both) is even, then we can answer the question.

Statement One Alone:

The sum A + B is odd.

In order for the sum of two integers to be odd, one of them must be even and the other must be odd. That is, either A is even and B is odd OR A is odd and B is even. In either case, the product AB is even, since one of them is even. Thus, statement one alone is sufficient to answer the question. We can eliminate answer choices B, C and E.

Statement Two Alone:

A is even.

Since we know that the product of an even integer and any other integer is always even, we know that the product AB will always be even.

Statement two is also sufficient.

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Re: If A and B are positive integers, is the product AB even? [#permalink]

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03 Dec 2016, 17:30
Here is my solution ->
Here we need the Even odd nature of A*B
as A and B are integers
A*B will be even if anyone of A or B is even OR both A and B are even

Statement 1
A+B=odd
A+B will be odd only when A and B will have the Different Even/odd nature
Hence If A is odd => B will be even
And if B is odd => A id even
Hence one out of A and B will always be Even
Hence Sufficient
Statement 2
A is even
As is even => A *B will Even
Hence Sufficient
Hence D

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Mock Test -2 (Integer Properties Advanced Quiz) --->http://gmatclub.com/forum/stonecold-s-mock-test-217160.html#p1765951

Mock Test -2 (Evens and Odds Basic Quiz) --->http://gmatclub.com/forum/stonecold-s-mock-test-217160.html#p1768023

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Re: If A and B are positive integers, is the product AB even?   [#permalink] 03 Dec 2016, 17:30
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