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if sum(r=0)^(25).^(50)C(r)(.^(50-r)C(25-...

if `sum_(r=0)^(25).^(50)C_(r)(.^(50-r)C_(25-r))=k(.^(50)C_25)`, then k equals:

A

`2^(25)`

B

`2^(25) -1`

C

`2^(24)`

D

`(25)^(2)`

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The correct Answer is:
A
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