is always divisible by p if p is prime? Thanks for any help
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Originally Posted by hmmmm is always divisible by p if p is prime? Thanks for any help Yes, unless . In fact, it is true as long as is ANY odd number. Try rewriting the sum (for , in which case is odd):
as p-1 is even (so divisible by 2) then it is divisible by p?
Exactly. Writing the sum as I did above, you immediately get what you have just written.
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