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lidiya [134]
3 years ago
8

Evaluate 11p4 and 9c5

Mathematics
1 answer:
MariettaO [177]3 years ago
7 0
\bf _{n}P_{r}=\cfrac{n!}{(n-r)!}\qquad \qquad _{11}P_4=\cfrac{11!}{(11-4)!}
\\\\\\
_nC_r=\cfrac{n!}{r!(n-r)!}\qquad \qquad _9C_5=\cfrac{9!}{5!(9-5)!}



check your calculator on the factorial(!) button.
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