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Thre are n identical red balls & m ident...

Thre are `n` identical red balls & `m` identical green balls. The number of different linear arrangements consisting of `"n` red balls but not necessarily all the green balls" is `.^(x)C_(y)` then:

A

`x=m+n`

B

`y=m`

C

`x=m+n+1`

D

`y=n`

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