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- May 26th 2010, 09:11 PM #1

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- May 27th 2010, 02:24 AM #2

- May 27th 2010, 06:01 AM #3

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- May 27th 2010, 07:10 AM #4
Personally, I would do question (b), then extend it for all primes p. This is the contrapositive of (a)*, so you are done.

That is a bit roundabout though, so there may be an easier way...

*The contrapositive: Instead of proving you prove . These two things are equivalent.