In the expansion of (1+x)^(m+n)the co-ef...

In the expansion of `(1+x)^(m+n)`the co-efficient of `x^m`is

A

a)`(m!n!)/(m+n)`

B

b)`(m+n)!`

C

c)`((m+n)!)/(m!n!`

D

d)none of these

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