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OpenStudy (anonymous):
Simplify: (n-r)!/(n-r+1)!
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OpenStudy (agreene):
\[\frac{1}{n-r+1}\]
jimthompson5910 (jim_thompson5910):
(n-r)!/(n-r+1)! (n-r)!/[(n-r+1)(n-r)!] 1/(n-r+1)
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