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Proof

DJJONES91
DJJONES91 


Prove that for any integer n, n(n^2-1)(n+2) is divisible by 4. Attachments
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Proof by induction for all n > 1

billfeinberg
billfeinberg 



Let S = n(n^2-1)(n+2)
Show S(1) is divisible by 4.
1(1-1)(3) = 0. 0 is divisible by 4.
Show S(n+1) is divisible by 4.
S(n+1)
=...
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