Evaluate.
-${ } _ { 20 } \mathrm { P } _ { 4 }$
A) 6840
B) $2.43 \times 10^{18}$
C) 116,280
D) $1,860,480$

Name: Evaluate. -${ } _ { 20 } \mathrm { P } _ { 4 }$ A) 6840 B) $2.43 \times 10^{18}$ C) 116,280 D) $1,860,480$
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Question

Quizplus · Accepted Answer

The permutation formula is $ nP_r = \frac{n!}{(n-r)!} $. For ${ } _ { 20 } \mathrm { P } _ { 4 }$, it is $\frac{20!}{(20-4)!} = \frac{20!}{16!} = 20 \times 19 \times 18 \times 17 = 116,280$.

Evaluate - 20P4{ } _ { 20 } \mathrm { P } _ { 4 }20​P4​

Evaluate
- ${ } _ { 20 } \mathrm { P } _ { 4 }$