Montenovofe

2022-07-05

How do you evaluate 20P2?

Gornil2

Beginner2022-07-06Added 20 answers

Step 1

The general formula for a permutation is

$\text{}}_{n}{P}_{r}=\frac{n!}{n-r!$

Step 2

In this case, $n=20$ and $r=2$, so our equation becomes

${\text{}}_{20}{P}_{2}=\frac{20!}{18!}=(20\times 19)=380$

The general formula for a permutation is

$\text{}}_{n}{P}_{r}=\frac{n!}{n-r!$

Step 2

In this case, $n=20$ and $r=2$, so our equation becomes

${\text{}}_{20}{P}_{2}=\frac{20!}{18!}=(20\times 19)=380$

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