Use the geometric summation formula to show that for any positive integers a > 2 and...

 

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Use the geometric summation formula to show that for any positive integers a > 2 and n, a" – 1 is divisible by a - 1. [In light of material yet to be covered, this shows that a" –1 cannot be prime if a > 2 and n > 1.] Use the geometric summation formula to show that for any positive integers a > 2 and n, a" – 1 is divisible by a - 1. [In light of material yet to be covered, this shows that a" –1 cannot be prime if a > 2 and n > 1.]

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