Question

find the 20th and nth term of the GP. 5/2,5/4,5/8

Answer 1

Answer:

a=5/2

d=-5/4

s20=an=a+n-1 d

a20=5/2+20-1-5/4

=5/2+19*-5/4

=5/2+-95/4

=-85

So,the 20th term of AP Is -85