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The value of ""^(40) C(31) + sum (r = 0)...

The value of `""^(40) C_(31) + sum _(r = 0)^(10) ""^(40 + r) C_(10 +r)` is equal to

A

`""^(51)C_(20)`

B

`2""^(50)C_(20)`

C

`2""^(45)C_(15)`

D

`""^(51)C_(21)`

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The correct Answer is:
A
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