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7 years, 10 months ago
7 years, 10 months ago
Let the G.P. be a, a*r, a*r^2 and so on till infinity.
Given, a = Sum of the infinite terms starting from a*r
Therefore a = 7 [a*r / 1-r]
'a' will get cancelled on both sides. Solve for 'r'.
r = 1/8