Question

In an A.P. the sum of first n terms is sn = 5n*2/2 +3n/2 . Find the 17th term.. plz anyone

Answer 1

Answer:

Sn=5n^2/2+3n/2

S1=5(1)^2/2+3(1)/2

=5/2+3/2

=8/2

=4

S2=5(2)^2/2+3(2)/2

=10+3

=13

S1=a1=4

S2=a2=13

d=a2-a1

=13-4

=9

a17=a+16d

=4+16(9)

=144+4

=148

Hope you will able to understand.