Friday, April 4, 2014

Given 50+42+34+26+18+ ... find n such that Sn=182

a%5B1%5D=50 and d=-8



so
%0D%0A182=-4n%5E2%2B54n%0D%0A

which has only one suitable solution, n=7 (why?)

checking...
50+42+34+26+18+10+2=182
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