The sum of 2n terms of a series of which...

The sum of 2n terms of a series of which every even term is a times the term before it, and every odd term is c times the term before it, the first term being unity is

A

`((1-a)/(1+ac))(1-a^(n)c^(n))`

B

`((1+a)/(2+ac))(1-a^(n)c^(n))`

C

`((1+a)/(1-ac))(1-a^(n)c^(n))`

D

None of these

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The correct Answer is:

C

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