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age0, then sum(n=1)^(infty)((a)/(a+1))^(...

`age0`, then `sum_(n=1)^(infty)((a)/(a+1))^(n)` equals

A

1: `(a+1)/(2 a+1)`

B

2: `(a)/(2 a+1)`

C

3: `a+1`

D

4: `a`

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The correct Answer is:
D
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