Find the sum to the indicated number of terms in the geometric progression: $1, -a, a^{2}, -a^{3}, \ldots$ to $n$ terms (if $a \neq -1$).
- A$\frac{1-(-a)^{n}}{1+a}$
- B$\frac{1+(-a)^{n}}{1+a}$
- C$\frac{1-(-a)^{n}}{1-a}$
- D$\frac{1+(-a)^{n}}{1-a}$
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