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Old 2017-12-22, 07:54   #7
LaurV
Romulan Interpreter
 
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Jun 2011
Thailand

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Even simpler, A+1 = 1 (mod A).
Therefore, (A+1)^n = 1^n = 1 (mod A).
Nothing to prove.

(to be moved to misc math)

Last fiddled with by LaurV on 2017-12-22 at 07:55
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