GARY12

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Questions

The following questions were asked by visitors named GARY12.

In the arithmertic sequence series: a+(a+d)+(a+2d)+...+(l-d)+l,a is the first term,d the common difference and l the last term. how do prove that Sn=n/2[a+1]
10 years ago

Answers

The following answers were posted by visitors named GARY12.