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If ""^(n)C r denots the numbers of comb...

If `""^(n)C _r` denots the numbers of combinations of n things taken r at a time, then the expression ` ""^(n) C_(r+1) +""^(n)C_(r-1) +2 xx ""^(n)C_r` equals
` ""^(n+2) C_(r+1) `

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