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the sum of n terms of the series
1, (1+2), (1+2+3)............is
A) (n/3)(n+1)(n-1) B)(n/6)(n+1)(n-1)
c) (n²+3n+20) D) none
10 years ago

Answers

Reiny
try it yourselves, using the method I showed in your two other posts of this type
10 years ago

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