Permutation Calculator

A permutation is an arrangement of objects in a specific order. The number of permutations of r items from a set of n items is given by:

To calculate permutations, follow these steps:

1. 1
   Identify the total number of items (n)
2. 2
   Determine how many items to arrange (r)
3. 3
   Calculate n! (factorial of n)
4. 4
   Calculate (n-r)! (factorial of n-r)
5. 5
   Divide n! by (n-r)! to get the number of permutations

Key points about permutations:

• 1
  Order Matters:

  In permutations, the order of arrangement is important.

• 2
  No Repetition:

  Each item can only be used once in the arrangement.

• 3
  Factorial Growth:

  The number of permutations grows very quickly with n and r.