SOLUTION: If a and b are prime numbers which if the following cannot be the sum of a and b? A)13 B)16 C)25 D)27

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Question 1143895: If a and b are prime numbers which if the following cannot be the sum of a and b?
A)13
B)16
C)25
D)27
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
13 = 2 + 11.


16 = 5 + 11.


25 = 2 + 23.


27 can not be the sum of two primes, since then one of them must be even number (i.e. 2),  but 27 - 2 = 25 IS NOT a PRIME.


ANSWER.  27.