1.

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

Answer»

`""^(51)C_(20)`
`2""^(50)C_(20)`
`2""^(45)C_(15)`
`""^(51)C_(21)`

ANSWER :A


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