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Let `f(n ,k)` denote the number of ways in which `k` identical balls can be colored with `n` colors so that there is at least one ball of each color. Then `f(n ,2n)` must be equal to a. `^2n C_n` b. `^2n-1C_(n+1)` c. `^2n-1C_n` d. none of these

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