Question

An ap consists of 50 terms of which 3rd term is 12 and last term is 188 find the 39th term

Answer 1

Answer:

n=50

a3=12

an=188

a39=?

a+2d=12

a+49d=188

equation (1)and(2)

a+49d=188

a+2d=12

47d=178

d=4

a+2d=12

a+2(4)=12

a=12-8

a=4

a39=a+38d

=4+38(4)

=4+152

a39=156