Question

Sum of infinite number of terms of a G.P. is 20 and sum of their squares is 100. The common ratio of the G.P. is

• A. 5
• B. 3/5
• C. 8/5
• D. 1/5

Answer 1

Answer: (B)

3/5

Answer 2

r = $\frac { x ^ { 2 } - y } { x ^ { 2 } + y }$ ; x = 20, y = 100