A) \[\frac{a}{2}(1+r)\,{{r}^{\frac{n+1}{2}}}\]
B) \[\frac{a}{2}(1-r)\,{{r}^{\frac{n+1}{2}}}\]
C) \[\frac{a}{2}(1+r)\,{{r}^{\frac{n-1}{2}}}\]
D) \[\frac{a}{2}(1-r)\,{{r}^{\frac{n-1}{2}}}\]
E) None of these
Correct Answer: C
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