1.

Use the identity (1+x)^(m)(1+x)^(n)=(1+x)^(m+n) to prove Vandermonde's theorem, ""^(m)C_(r ) +""^(m)C_(r-1). ""^(n)C_( 1)+""^(m)C_(r -2) *""^(n)C_(2) +….+""^(n)C_(r )=""^((m+n))C_(r )

Answer»

`""^((m+n)) C_r`
`""^(MN) C_r`
`""^((m+n)) C_(r+1)`
`((m+n)) C_(r-1)`

ANSWER :A


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