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Mathematics 9 Online
OpenStudy (anonymous):

evaluate the expression 8c3

OpenStudy (m):

8!/(8-3)!3!

OpenStudy (anonymous):

8!(8-3)=5!3!

OpenStudy (anonymous):

so it comes out to 8!(5!) and 3!

OpenStudy (m):

is this combination problem? forgot what C stands for

OpenStudy (anonymous):

would it come to 24c?

OpenStudy (m):

you just solve the factorials

OpenStudy (m):

so 8x7x6/3x2x1

OpenStudy (m):

8C3 is 8!/ (5! * 3!)

OpenStudy (anonymous):

224?

OpenStudy (m):

answer is 56

OpenStudy (m):

nCr = n! / ( (n-r)! * r!) is the formula

OpenStudy (anonymous):

so 56?

OpenStudy (anonymous):

for all of it?

OpenStudy (m):

yeah 336/6 = 56

OpenStudy (m):

8C3 = 56 :)

OpenStudy (anonymous):

ok thx

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