Marbles problem in Mathematics section

#1

Can anyone please tell me how to approach this problem?

#2

You can do this problem with pure PnC. Only difficulty you might face is calculating nCr which you can calculate in this fashion to avoid overflow.
ans = (n/1)(n-1/2)(n-3/3)…
For detailed explanation, please go through this link.
Link

#3

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#4

Thanks for resolving my doubt. I have done the above said thing.

#5

Great to hear that :smile: