raytray41
raytray41
23-05-2018
Mathematics
contestada
can someone please help Thank you
Respuesta :
mathmate
mathmate
23-05-2018
Formulas to solve given problems:
nPr = n! / (n-r)!
nCr = n! / ((n-r)! r!)
12P3 = P(12,3) = 12! / (12-3)! = 12! /9! =12*11*10 = 1320
10C7 = C(12,7) = 10!/((10-7)!7!) = 10!/(3!7!) = 10*9*8 / (1*2*3) = 120
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