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11 Feb 2019, 00:36
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
71% (01:25) correct
29%
(01:19)
wrong
based on 113
sessions
History
Date
Time
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Not Attempted Yet
If a and b are different prime numbers, which of the following numbers must be odd?
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
KanishkM
Joined: 09 Mar 2018
Last visit: 18 Dec 2021
Posts: 765
Given Kudos: 123
Location: India
Schools: DeGroote'21 Desautels '21 NUS '21
11 Feb 2019, 00:55
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Bunuel
If a and b are different prime numbers, which of the following numbers must be odd?
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
lets plug in here, C1: a = 2 b = 3 or
C2 : a = 11 b = 2(Take big values as well)
C3 : a = 3, b = 5
A) Even using C1
(B) 4a + b, Even using C2
(C) a + b + 3, Even using C1
(D) ab – 3, Even using C3
E) 4(a + b) + 3, Always odd
Will be Even
11 Feb 2019, 09:19
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Bunuel
If a and b are different prime numbers, which of the following numbers must be odd?
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
(A) ab
(B) 4a + b
(C) a + b + 3
(D) ab – 3
(E) 4a + 4b + 3
A)2*3 = 6 but 3*5 = 15.
B) 4a = even b= 2. even + even = even.
C) 3 + 2 + 3 = 8. even
D) 3*5 - 3 = 12 . even.
E) This our answer by the process of elimination.
E is the correct answer.
