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Help me with a Combinatorics problem
Here, Uva 13043- Marbles
How to solve it?
I had an idea. As example for for 3rd case =
ans is 900C20 * 880C20 * 860C20 * 840C20 * 820C20
As the k<=50 I can do it k times By reducing X from N every time. But my this code doesn't work correctly. Help me Someone plz.
