IN JAVA!!!!

Write a method named permutation( ) that calculates the number of permutations for given n and r values.

Permutation formula:

P(n,r)= n!/(n-r)!

Note:

n! = n * (n-1) * (n-2) * * 1

0! = 1

Tip: It will be helpful to create a separate factorial( ) method and call this method within your

permutation( ) method. (Only call factorial( ) in permutation( ). Do not call factorial( ) in main.)

Test your implementation on:

n = 5 n = 5 n = 5 n = 5

r = 0 r = 2 r = 4 r = 5