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The value of sum(r=0)^(20)r(20-r)(.^(20)...

The value of `sum_(r=0)^(20)r(20-r)``(.^(20) C_r)^2` is equal to
a. `400^(39)C_(20)` b. `400^(40)C_(19)` c. `400^(39)C_(19)` d. `400^(38)C_(20)`

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