The coefficient x^5 in the expansion of...

The coefficient `x^5` in the expansion of `(1+x)^(21)+(1+x)^(22)++(1+x)^(30)` is a. `"^51 C_5` b. `"^9C_5` c. `"^31 C_6``-"^(21)C_6` d. `"^30 C_5`+`"^(20)C_5`

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