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The value of sum(r=0)^(10)(r)^(20)Cr is ...

The value of `sum_(r=0)^(10)(r)^(20)C_r` is equal to: a. `20(2^(18)+^(19)C_(10))` b. `10(2^(18)+^(19)C_(10))` c. `20(2^(18)+^(19)C_(11))` d. `10(2^(18)+^(19)C_(11))`

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