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OpenStudy (anonymous):
Somebody please please please help me!
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OpenStudy (anonymous):
OpenStudy (anonymous):
Ok that's easy: Know this expression------------> nCr = n!/(n-r)!r! = nPr/r! 13!/(9!)4! => (13*12*11*10)/24 = 13*11*5 .......Hope you get it.............
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