Question

Evaluate 25P20 where p means permutations

Answer 1

Answer:

$1.29*10^{23}$

Step-by-step explanation:

nPr, or Permutations; is the number of ways of picking 'r' objects from 'n' objects, where the order of picking matters. The condition is that 'n' has to be either greater than or equals 'r'.

The formula is:

$nPr=\frac{n!}{(n-r)!}$

Therefore, $25P20=\frac{25!}{(25-20)!}$

$=\frac{25!}{5!}=1.29*10^{23}$