Question

Find out the G.P. whose 5th term is 80
and 8th term is 640.

Answer 1

Answer:

GP = ( 5,10.20.40.80...........)

Step-by-step explanation:

5 TH TERM = 80

ar4 = 80

a= 80/r4

8 th term = 640

ar7 = 640

80/r4 * r7 = 640

r3 = 640/80

r3 = 8

r = 2

a( 2 )powr4 = 80

a = 80 / 16

a = 5