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# If f and g are integers, is fg + 2 prime?

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If f and g are integers, is fg + 2 prime? [#permalink]

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12 Oct 2012, 00:37
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Question Stats:

42% (01:49) correct 58% (00:43) wrong based on 121 sessions

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If f and g are integers, is fg + 2 prime?

(1) f is odd.
(2) g is even.
[Reveal] Spoiler: OA

Last edited by Bunuel on 12 Oct 2012, 00:40, edited 1 time in total.
Edited the question.
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Re: If f and g are integers, is fg + 2 prime? [#permalink]

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12 Oct 2012, 00:48
If f and g are integers, is fg + 2 prime?

(1) f is odd.
(2) g is even.

Even when we take the statements together they are not sufficient to answer the question:

If f is any odd number and g=0, then fg+2=2=prime;
If f is any odd number and g=2, then fg+2 is some even number other than 2, thus not a prime.

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Re: If f and g are integers, is fg + 2 prime? [#permalink]

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25 Feb 2016, 07:40
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Re: If f and g are integers, is fg + 2 prime?   [#permalink] 25 Feb 2016, 07:40
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