Question

A=3 d=3. n=12 find sn

Answer 1

HERE IS THE ANSWER OF YOUR QUESTION :-
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We have given;

a = 3

d = 3

n = 12

we have to find sn = ?

So, formula used here is,

sn = n/2[2a + (n - 1) d]

sn = 12/2[3 x 2 + (12 - 1) 3]

sn = 6 [6 + 11 x 3]

sn = 6[6 + 33]

sn = 6 (39)

sn = 234

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HOPE IT HELPS YOU.