5) Let n be a positive integer such that 7 | (8-1). Prove that 7 | (8=*1 - 1). (Hint: Rewrite 8*1 -1, where a portion of the expression is 8 times 8ª - 1.)

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5) Let n be a positive integer such that 7 | (8-1). Prove that 7 | (8=-1 - 1). (Hint: Rewrite 8=-1 -1,
where a portion of the expression is 8 times 8ª - 1.)
Transcribed Image Text:5) Let n be a positive integer such that 7 | (8-1). Prove that 7 | (8=-1 - 1). (Hint: Rewrite 8=-1 -1, where a portion of the expression is 8 times 8ª - 1.)
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