Question

find the first and third term of AP if second term is 13 .​

Answer 1

Let a is first term and d is common difference.

Therefore

First term=a

Second term=a+d

Third term=a+2d

but given that

a+d=13

a=13-d

Third term=a+2d

=13-d+2d

=13+d

First term=13-d