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2 ways to prove it (Posted on 2017-10-31) Difficulty: 2 of 5
For every positive integer n: 10n+18*n-1 is divisible by 27.

The above statement can be proven by more than one way.

Find at least 2 distinct methods.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Solutionmy offered proofs... are they really the sameCharlie2017-10-31 13:58:26
SolutionMethod 1chun2017-10-31 12:29:13
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