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The sum of fi...

Question

The sum of first n terms of a G.P. whose first term is a and common ratio is r is

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a (rⁿ - 1) / (1-r)

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a (1-rⁿ) / (1-r)

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a (rⁿ - 1) / (1+r)

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Solution

The correct option is C
a (1-rⁿ) / (1-r)

sum of first n terms of a G.P. whose first term is a and common ratio is r is $[a (1 - r^{n}) / (1 - r)]$

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