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10 Dec 2018, 11:13
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A
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Difficulty:
5%
(low)
Question Stats:
93% (00:32) correct
7%
(01:10)
wrong
based on 70
sessions
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Not Attempted Yet
Which of the following is a prime number?
(A) 101
(B) 111
(C) 1011
(D) 1101
(E) 1110
(A) 101
(B) 111
(C) 1011
(D) 1101
(E) 1110
10 Dec 2018, 11:20
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topper97
USEFUL RULE: If the sum of the digits of integer N is divisible by 3, then N is divisible by 3.
For example, 2 + 6 + 4 = 12, and 12 IS divisible by 3. So, the number 264 must be divisible by 3.
Notice that, in answer choices B, C, D and E, the sum of the digits is 3.
Since 3 divisible by 3, each of those 4 values is divisible by 3, which means they are NOT prime.
Answer: A
Cheers,
Brent
AkshayDang
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16 Sep 2024, 09:01
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We can observe that options b,c,d ,e are divisible by 3. Hence Answer is A
