ROBOT.LK

Can someone explain to me the key difference as to why the Combination and permutation formulas are different by n!

Combination=
C(n,r)=n!/(n-r)!

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

Any help would be very beneficial for me.

Thanks and Regards
Andy Charles

If you have searched the forum, you would have found the following articles.

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