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" Exove that "n(n-1)(n-2)...(n-r+1)=(n!)...

" Exove that "n(n-1)(n-2)...(n-r+1)=(n!)/((n-r)!)

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Prove that n(n-1)(n-2) ...(n-r+1)=(n!)/((n-r)!).

Prove that: n(n-1)(n-2)…..(n-r+1)=(n!)/((n-r)!)

Prove that: n(n-1)(n-2)....(n-r+1)=(n !)/((n-r)!)

Prove that n(n-1)(n-2)......(n-r+1)=(n!)/(n-r)!

Prove that (n-r+1)(n!)/((n-r+1)!)=(n!)/((n-r)!)

Prove that (n-r+1)(n!)/((n-r+1)!)=(n!)/((n-r)!)

Prove that (n-r+1)((n!)/((n-r+1)!))=((n!)/((n-r)!))

Prove that ((n-1)!)/((n-r-1)!)+r.((n-1)!)/((n-r)!)=(n!)/((n-r)!)

Prove that : (i) (n!)/(r!)=n(n-1)(n-2)...(r+1) (ii) (n-r+1)*(n!)/((n-r+1)!)=(n!)/((n-r)!) (iii) (n!)/(r!(n-r)!)+(n!)/((r-1)!(n-r+1)!)=((n+1)!)/(r!(n-r+1)!)

Prove that (n!)/(r!(n-r)!)+(n!)/((r-1)!(n-r+1)!) =((n+1)!)/(r!(n-r+1)!)