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03 Aug 2019, 23:07
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C
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% (00:34) correct
14%
(00:42)
wrong
based on 102
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What is the next-highest prime number after 67?
A. 68
B. 69
C. 71
D. 73
E. 76
A. 68
B. 69
C. 71
D. 73
E. 76
Source: Test Prep Review
04 Aug 2019, 06:51
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If a number less than 120 is not divisible by 2, 3, 5 or 7, it is a prime number. 68 is divisible by 2, and 69 is divisible by 3 (as you can see by summing its digits). 71 is not divisible by 2, 3, 5 or 7 so it is prime.
prodigyazu
05 Aug 2019, 07:01
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All Primes above 3 are of the form (6n-1) or (6n+1).
In this case, 67, is of the form (6n+1), as {(6*11) + 1} = 67. So, the next prime number will be of (6n-1) form, i.e {(6*12) - 1} = 71.
Hence, the answer is 71 (C).
In this case, 67, is of the form (6n+1), as {(6*11) + 1} = 67. So, the next prime number will be of (6n-1) form, i.e {(6*12) - 1} = 71.
Hence, the answer is 71 (C).
