Question

find the sum of first 22 terms of an AP in which D=7 and 22nd term is 149

Answer 1

Hope it helps ...................

Answer 2

Answer:

22n term=149

d=7

a+21d=149

a+21(7)=149

a+147=149

a=149-147

a=2

S=n/2(2a+(n-1)d)

=22/2(4+(22+1)7

=11(4+21×7)

=11(4+147)

=11×151

S=1661