Permutations Involving Repeated Symbols - Example 2

Описание: Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! :)   / patrickjmt   !! Permutations Involving Repeated Symbols - Example 2. In this example, we count how many ' stair case ' paths there are from the origin to the point (5,3).