pmmabry2001 pmmabry2001

25-01-2018
Mathematics

contestada

simplify the expression 7C4

Respuesta :

CastleRook CastleRook

06-02-2018

to simplify 7C4 we use the combination formula given by:
nCr=n!/[(n-r)!r!]
thus:
In our case we shall have:
n=7 and r=4
7C4
=7!/[(7-4)!4!]
=5040/[6×24]
=5040/144
=35

The answer is 35

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