सिद्ध कीजिए कि `(.^(n)p\_(r))/(.^(n)p\_(r-2))=(n-r+2)(n-r+1)` 
सिद्ध कीजिए कि `(.^(n)p\_(r))/(.^(n)p\_(r-2))=(n-r+2)(n-r+1)` 
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