write the formula to find the sum of the first n term of an ap whose f – InterviewSolution

1.

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»

$sum = \frac{n}{2} (a + l) \\ \\ where \: n = no \: of \: terms \\ a = first \: term \\ l = last \: term$

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