Question

write the formula for sum of first 'n' terms in AP and explain each term it ?
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Answer 1

Answer:

$S _{n} = \frac{n}{2} (2a + (n - 1)d)$

$S _{n} = sum \: of \: |n| terms$

$n = number \: of \: terms$

$a = first \: term$

$d = common \: difference$