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The value of sum(r=0)^(50)(-1)^r(^(50)Cr...

The value of `sum_(r=0)^(50)(-1)^r(^(50)C_r)/(r+2)` is equal to `1/(50xx51)` b. `1/(52xx50)` c. `1/(52xx51)` d. none of these

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