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mihir mehan Grade: 12
        

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

7 years ago

Answers : (1)

Nehal Wani
21 Points
										

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)

7 years ago
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