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`underset(k=1)overset(oo)sum underset(r=0)overset(k)sum (1)/(3^(k))(""^(k)C_(r))` is equal to

A

`(1)/(3)`

B

`(2)/(3)`

C

1

D

2

Text Solution

Verified by Experts

The correct Answer is:
D
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