Question

Find the sum of first and last term of an AP whose middle term is 8

Answer 1

in an arithmetic progression we have
2( middle term )=sum of first and last terms
so here 2(8)=sum of first and last term
hence 16 is the answer

Answer 2

a + (n/2-1)d = 8
a+a + (n-1)d= 2a + (n-1)d = 16+d 16+d is answer
2(a+ (n/2-1)d) = 16
2a + dn-2d= 16