Question

the sum of n terms of an A.P is 5n^2-3n.find the 10th term.

Answer 1

Sum of n terms of A.P is 5n^2-3n.

So

Sum of 20 terms is 5×20^2-3×20

=5×400-60

=2000-60

=1940

So 10th term is 1940/20

=97

May be ,10th term is 97.....