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Find a counterexample to the statement 4^n + 1 is divisible by 5...how do i show my work for this problem? The example in my book is too confusing it doesnt really go into detail but just shows a table.
17 years ago

Answers

Count Iblis
What happens if yo put n = 1?
17 years ago
Tracy
I get 4^1+1=5 divided by 5 =1?
17 years ago
Tracy
NVM i figured it out =)
17 years ago
mk-tintin
n=2
17 years ago
mk-tintin
4 = -1 [5]
4^n = (-1)^n [5]
4^n + 1 = (-1)^n + 1 [5]

so if n=2k+1 4^n + 1 is divisible by 5
17 years ago

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