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If a and b are positive integers, is ab odd?

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If a and b are positive integers, is ab odd?  [#permalink]

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New post 31 Aug 2018, 23:04
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A
B
C
D
E

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  35% (medium)

Question Stats:

64% (01:20) correct 36% (01:14) wrong based on 93 sessions

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Math Expert
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Re: If a and b are positive integers, is ab odd?  [#permalink]

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New post 31 Aug 2018, 23:24
If a and b are positive integers, is ab odd?

(1) a + b is odd.
a+b as odd is possible ONLY when one of them is positive and other negative.
if any of a and b is even, ab will be even..
sufficient

(2) a^b is even.
this means a is even
ab will be even
sufficient

D
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Re: If a and b are positive integers, is ab odd?  [#permalink]

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New post 01 Sep 2018, 00:49
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Bunuel wrote:
If a and b are positive integers, is ab odd?

(1) a + b is odd.

(2) a^b is even.
Answer is D
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Re: If a and b are positive integers, is ab odd?   [#permalink] 01 Sep 2018, 00:49
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