enidsiadarby
enidsiadarby
18-09-2017
Mathematics
contestada
evaluate 11p4 and 9c5
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jdoe0001
jdoe0001
18-09-2017
[tex]\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)!} [/tex]
check your calculator on the factorial(!) button.
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