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Ymorist [56]
2 years ago
10

Evaluate the expression: 18P4 A. 3,060 B. 12,240 C. 18,360 D. 73,440

Mathematics
2 answers:
Alexxandr [17]2 years ago
5 0

18P4=\dfrac{18!}{(18-4)!}=\dfrac{18!}{14!}=15\cdot16\cdot17\cdot18=73440

jeka57 [31]2 years ago
3 0

\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \qquad _{18}P_4=\cfrac{18!}{(18-4)!}

one may note that, your calculator besides having a [ ! ] factorial button, it also has a [ ₙPᵣ ] button for permutations, and you can use that too.

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