Question

The first term of an AP is 2 and the

common difference is 3. Find the sum
of the first 11 terms. (JAMB]​

Answer 1

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

n=11

a=2

d=3

Sn= 11/2[2(2) + (11-1)3]

Sn= 11/2(34)

Sn = 11x17

=187.