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Airida [17]
3 years ago
5

I have some idea about how to solve this but I am not sure So please show your work

Mathematics
1 answer:
Anuta_ua [19.1K]3 years ago
4 0
NPr=\frac{n!}{(n-r)!}
9P3=\frac{9!}{(9-3)!}=
9!/6!=(9*8*7*6*5*4*3*2*1)/(6*5*4*3*2*1) cancel=
(9*8*7)/(1)=504 ways


nCr=\frac{n!}{r!(n-r)!}
10C4=\frac{10!}{4!(10-4)!}=
\frac{10!}{4!(6)!}=
\frac{10*9*8*7*6*5*4*3*2*1}{4*3*2*1*6*5*4*3*2*1}, cancel=
\frac{10*9*8*7}{4*3*2*1}=
\frac{2*5*3*3*2*4*7}{4*3*2*1}=
\frac{5*3*2*7}{1}=210





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