Question

the sum of first two terms of a GP is 36 and the product of the first and the third term is 9 times the second term find the sum of the first 8terms​

Answer 1

Answer:

a+ar=36

a(ar2)=9ar

ar=9

a=27

r=1/3

sum of first eight terms

27((1-(1/3)7)/1-1/3

27(1-1/2187)/2/3

3×27(2186/2187)/2

1093/243

hope it helps you