Math, asked by tanubhavna6999, 9 months ago

Write formula to find - sum of 1st n terms of an AP whose 1st term is A and last term is a.n

Answers

Answered by rama1817

23

Answer:

Sn=n/2(a+a.n)

hope this helps and make me the brain list

Answered by sonupatelpatel9164

9

Answer:

i need step by step answer

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