Question

Find the sum of first 22 terms of an AP in which d=7, and 22nd term is 149.​

Answer 1

Step-by-step explanation:

a+21d =149

d=7

so a=2

sum of 1st 22 terms 22a +21×11d

=44+924

=968

Answer 2

Answer:

S22=1661

Step-by-step explanation:

A22=a+21d

149=a+21*7

a=149-147=2

THus sum of 22 terms

S22=22/2( 2*2+21*7)

=11*(4+147)

=11*151

=1661