Question

The number of permutations of 'n' different objects taken 'r' at a time is given by

• A. ${}^n{P}_r=\frac{n!}{n-r!}$
• B. ${}^n{P}_r=\frac{r!}{n-r!}$
• C. ${}^n{P}_r=\frac{r-n!}{n-r!}$
• D. ${}^n{P}_r=\frac{n!}{n^2-r!}$

Answer 1

The correct option is A ${}^n{P}_r=\frac{n!}{n-r!}$

The number of permutations of 'n' object taken 'r' at a time is given by
${}^n{P}_r=\frac{n!}{n-r!}$