Question

write the formula to find the sum of the first n term of an ap whose first term is'a' and the last term is a n​

Answer 1

Answer:

The formula to find the sum of the first n terms of an AP whose first term is 'a' and last term $a_{n}$ is-

$S_{n}$ = $\frac{n}{2}$($a$+$a_{n}$)

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