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[" Prove that: "],[(n!)/((n-r)!!!)+(n!)/...

[" Prove that: "],[(n!)/((n-r)!!!)+(n!)/((n-r+1)!(r-1)!)=((n+1)!)/(1!(n-r+1)!)]

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(ii) (n!)/((n-r)!r!)+(n!)/((n-r+1)!(r-1)!)=((n+1)!)/(r!(n-r+1)!)

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