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15 Oct 2019, 06:37
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
86% (00:40) correct
14%
(00:34)
wrong
based on 291
sessions
History
Date
Time
Result
Not Attempted Yet
If x is an odd integer, which of the following is also an odd integer?
(A) 2x
(B) 4x + 2
(C) x^2 + 3
(D) x^2 + x + 3
(E) x^2 + 2x + 1
(A) 2x
(B) 4x + 2
(C) x^2 + 3
(D) x^2 + x + 3
(E) x^2 + 2x + 1
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15 Oct 2019, 06:51
Kudos
Bookmarks
Bunuel
Substitution Method:
Let x = 1
(A) 2x --> 2 --> Even
(B) 4x + 2 --> 4*1 + 2 = 6 --> Even
(C) x^2 + 3 --> 1^2 + 3 = 4 --> Even
(D) x^2 + x + 3 --> 1^1 + 1 + 3 = 5 --> Odd
(E) x^2 + 2x + 1 --> 1^2 + 2*1 + 1 = 4 --> Even
IMO Option D
15 Oct 2019, 08:05
Kudos
Bookmarks
Bunuel
(A) 2*Odd = Even , Even + Even = Even
(B) 4*Odd = Even , Even + Even = Even
(C) Odd^2 = Odd , Odd + Odd = Even
(D) Odd^2 = Odd , Odd + Odd = Even , Even + Odd = Odd
(E) Odd^2 = Odd , 2*Odd = Even , Odd + Even = Odd , Odd + 1 = Even
Hencem Answer must be (D)
