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Induction proof

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Use mathematical induction to prove that : 1*2+2*3+3*4+....+n(n+1)(n+2)/3 for
all n >_1

and (2) Find d=gcd (721 , 448), find integers s and t with d=721s + 448t, and put the
fraction 448/721 in lowest terms.

Solution Summary

This is an induction proof regarding sum of series and greatest common denominator.