Question

The sum of nth term of an A.P.is 5n²-3n.find the A.P.hence , find its 10th term?

Answer 1

Step-by-step explanation:

If n=1 then,

S1=5-3=2

a1=2

If n=2 then,

S2=20-6=14

a1+a2=14

a2=14-2

=12

d=12-2=10

a10=2+(10-1)10

=2+9×10

=2+90

=92