How do you simplify ""_10P_810P8?

1 Answer

(10!)/(2!)=(10xx9xx8xx7xx6xx5xx4xx3xxcancel2)/cancel2=1,814,400

Explanation:

The permutation general formula is:

P_(n,k)=(n!)/((n-k)!); n="population", k="picks"

and so the question is how to calculate:

P_(10,8)=(10!)/((10-8)!)=(10!)/(2!)

There are two ways to do it:

(3,628,800)/2=1,814,400

  • Or we can show the multiplications:

(10xx9xx8xx7xx6xx5xx4xx3xxcancel2)/cancel2=1,814,400