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चार अंगुलियों में तीन रिंग (हर अंगुली में अधिकतम एक) कितनी प्रकार से पहनी जा सकती है ?

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चार अंगुलियों में तीन रिंग (हर अंगुली में अधिकतम एक) कितनी प्रकार से पहनी जा सकती है ?
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कुल अंगुलियाँ `= 4 = n`
कुल रिंग `= 3 = r`
`:. ""^(4)P_(3)= (4!)/((4-3)!) = (4!)/(1!) = 24`
`rArr 24` प्रकार से चार अंगुलियों में तीन रिंग पहनी जा सकती हैं।
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