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Sum of the series sum(k=1)^(oo)sum(r=0)^...

Sum of the series `sum_(k=1)^(oo)sum_(r=0)^(k)(2^(2r))/(7^(k))(""^(k)C_(r))` is:

A

`1//7`

B

`4//7`

C

2.5

D

`5.2`

Text Solution

Verified by Experts

The correct Answer is:
C
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