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# Which of the following numbers is not a sum of two prime numbers?

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Re: Which of the following numbers is not a sum of two prime numbers? [#permalink]
Gnpth wrote:
Which of the following numbers is not a sum of two prime numbers?
(A) 78
(B) 88
(C) 51
(D) 60
(E) 10

Every even number can be written as a sum of primes, however this is not the case with every odd number.

From the above only 51 is odd hence it becomes easy to mark C as the answer without checking.
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Re: Which of the following numbers is not a sum of two prime numbers? [#permalink]
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Re: Which of the following numbers is not a sum of two prime numbers? [#permalink]
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