Prove (7^n)-1 is divisible by 6,n>0
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Assume Then show that ...QED
Hello, Knigh17! A variation of galactus' solution . . . Prove is divisible by 6, Verify . . . true. Assume Add to both sides: . We have: . . . . . . . . . . . . . . . . . . . . . . .
Thanks a lot! now i know how this is solved.
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