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If x is an even integer, which of the following is an odd integer?

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If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 09 Nov 2015, 22:16
00:00
A
B
C
D
E

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Question Stats:

98% (00:20) correct 3% (00:21) wrong based on 171 sessions

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Re: If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 09 Nov 2015, 22:59
(A) 3x + 2
3*Even +2
= Even +Even = Even
(B) 7x
7*Even= Even
(C) 8x +5
8*Even +5
= Even +5
= Odd
(D) x^2
= Even * Even = Even
(E) x^3
= Even *Even * Even
= Even

Answer C
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If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 10 Nov 2015, 02:34
Bunuel wrote:
If x is an even integer, which of the following is an odd integer?

(A) 3x + 2
(B) 7x
(C) 8x +5
(D) x^2
(E) x^3


Straight C

Product of 2 even Number is an even number

Further sum of an even number and an odd number is always an Odd number .

Hence answer is undoubtedly C.
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Re: If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 10 Nov 2015, 08:39
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Bunuel wrote:
If x is an even integer, which of the following is an odd integer?

(A) 3x + 2
(B) 7x
(C) 8x +5
(D) x^2
(E) x^3


With questions like this, we can apply RULES related to odds and evens (as skywalker18 did), or we can just PLUG IN an even value for x.
The easiest value to plug in is 0

(A) 3(0) + 2 = 2 EVEN - ELIMINATE A
(B) 7(0) = 0 EVEN - ELIMINATE B
(C) 8(0) +5 = 5 ODD. DONE!!!
Answer: C

For "kicks" let's keep going (although, on test day, we would select C and move onto the next question.

(D) 0^2 = 0 EVEN - ELIMINATE D
(E) 0^3 = 0 EVEN - ELIMINATE E

Cheers,
Brent
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Re: If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 10 Aug 2016, 08:15
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Re: If x is an even integer, which of the following is an odd integer? [#permalink]

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New post 13 Apr 2017, 00:43
Option C

x is an Even integer. Odd: O, Even: E & Fraction: F

(A) 3x + 2 = 3*E + 2 = E + 2 =E
(B) 7x =7*E = E
(C) 8x +5 = 8*E + 5 = E + 5 = O
(D) x^2 = E^2 = E
(E) x^3 = E^3 = E
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Re: If x is an even integer, which of the following is an odd integer?   [#permalink] 13 Apr 2017, 00:43
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If x is an even integer, which of the following is an odd integer?

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