Question

find sum of 12 terms of AP 2,7,12,.................​

Answer 1

Answer:

A.P

=2,7,12.....

a=2

d=7-2=5

n=12

$s12 = \frac{n}{2} (2a + (n - 1)d)$

S12=12/2(2(2)+(12-1)5)

=6(4+55)

=6(59)

=354