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If p and q are integers and p + q + p is odd, which of the following m

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If p and q are integers and p + q + p is odd, which of the following m  [#permalink]

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New post Updated on: 17 Nov 2018, 07:39
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A
B
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D
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Question Stats:

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If p and q are integers and p + q + p is odd, which of the following must be odd?

(A) p
(B) q
(C) p+q
(D) pq
(E) pq+p

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Originally posted by EncounterGMAT on 17 Nov 2018, 05:34.
Last edited by EncounterGMAT on 17 Nov 2018, 07:39, edited 1 time in total.
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Re: If p and q are integers and p + q + p is odd, which of the following m  [#permalink]

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New post 17 Nov 2018, 05:48
Answer B:
If P is Odd -> p + p is even
If P is Even -> p + p is even

Therefore, q must be odd that p + q + p is also odd

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Re: If p and q are integers and p + q + p is odd, which of the following m  [#permalink]

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New post 17 Nov 2018, 06:33
Anser is choice B

q must be odd, e.g. follwing patterns;

2+1+2 = 5
1+3+1 = 5
1+2+1 = 4
2+4+2 = 8

Hence all combinations with an even q would yield even results, thus q must be odd.
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Re: If p and q are integers and p + q + p is odd, which of the following m  [#permalink]

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New post 17 Nov 2018, 07:20
topper97 wrote:
If p and q are integers and p + q + p is odd, which of the following must be odd?

(A) p
(B) q
(C) p+q
(D) pq
(E) pq+p


PLEASE FOLLOW THE FORUM GUIDELINES ; PLEASE POST THE OA ALONG WITH THE QUESTION.

\(p + q + p = ODD\)

Or, \(2p + q = ODD\)

Whatever be the value of \(p\) , \(2p\) must be \(Even\)

So, We have \(Even \ + \ q \ = \ ODD\); Thus, \(q\) must be ODD, Answer must be (B)
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Re: If p and q are integers and p + q + p is odd, which of the following m  [#permalink]

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New post 21 Dec 2018, 21:41
p + q + p = 2p + q
2p can’t be odd because it is a multiple of 2. Hence, q is odd.
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Re: If p and q are integers and p + q + p is odd, which of the following m   [#permalink] 21 Dec 2018, 21:41
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