Find the sum of first 22 terms of an AP in which 
and 22nd term is 149.
We have; n = 22, d = 7 and a22 = 149
We know;
an = a + (n – 1)d
Or, a = 149 – 147 = 2
The sum can be calculated as follows:
= 11*151
= 1661
11
Find the sum of first 22 terms of an AP in which and 22nd term is 149.
We have; n = 22, d = 7 and a22 = 149
We know;
an = a + (n – 1)d
Or, a = 149 – 147 = 2
The sum can be calculated as follows:
= 11*151
= 1661