Game:

Counter-Strike: Source (2004)

Duration: 6:00

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If every even term of a series is a times the term before
it and every odd term is c times the term before it, the first term being unity, then the sum to \( 2 n \) terms is
(A) \( \frac{(1-a)\left(1-c^{n} a^{n}\right)}{1-c a} \)
(B) \( \frac{(1+a)\left(1-c^{n-1} a^{n-1}\right)}{1-c a} \)
(C) \( \frac{(1-a)\left(1-c^{n-2} a^{n-2}\right)}{1-c a} \)
(D) none of these
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