1.

""^20C_10.""^15C_0 + ""^20C_9.""^15C_1 + ""^20C_8.""^15C_2 + …..+""^20C_0.""^15C_10 =

Answer»

`""^20C_10`
`""^25C_10`
`""^35C_10`
`""^40C_10`

ANSWER :C


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