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suppose a,b and n are positive integers, all greater than 1. if a^n + b^n is prime, what can you say about n?
A) integer must be 2
B)integer need not be 2, but must be a power of 2
C)integer need not be a power of 2, but must be even
D)none of the above
22+42=20 which is not a prime. Therefore (a) eliminated.
2 is also even. Therefore (c) eliminated.
34+54=706 which is not prime. Therefore option (b) eliminated.
Hence the correct option is (d)
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