Question

n+1P2=72 this is for permuations and combinations

Answer 1

Answer:

n=8

Step-by-step explanation:

The formula for $np_{r}$ is given by : $np_{r}$ = $\frac{n!}{n-r!}$

Using this,

$\frac{n+1!}{n-1!}$ = 72

=> n(n+1) = 72

=> n = -9 or 8

n can't be negative, therefore, n = 8