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यदि n व r धनात्मक पूर्णांक हैं 1 le r le...

यदि n व r धनात्मक पूर्णांक हैं `1 le r le n`, तब सिद्ध कीजिए कि `""^(n)C_(r) = n/(r ). ""^(n-1)C_(r-1)`

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