Verified answer

a1= (3/5)

q = (3/10)/(3/5) = 3/10. 5/3 = 15/30 = 1/2

(1-q) = (1- 1/2) = (1/2)

.......a1.....3/5.....3......2.....6

S = ----- = ---- = --- x --- = ---

.....(1-q)...1/2......5.....1......5