Asked by Don
Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).
Answers
Answered by
Steve
n = 2k+1
n^2 = 4k^2+4k+1 = 4(k^2+k) + 1
n^2 = 4k^2+4k+1 = 4(k^2+k) + 1
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