Poorly stated question, as it is ambiguous as to whether it is asking for the number of red balls that have been observed or the number that remain in the urn. Oh, "discarded" is spelled with a d. That much I can fix.
Agree with John D'Errico that the Problem Statement is ambiguous. For the record, based on case 5 of the Test Suite, it must be the _observed_ number of red balls that is to be computed.
Back to basics 15 - Benchmark
Back to basics 23 - Triangular matrix
Return elements unique to either input
Reverse the elements of an array
Calculate the sum of elements of n*n Hilbert matrix.
Probabilities - More brains than luck
A shooting competition
Non trivial identities - reshape
Remove collinear points in a set of 2D points defining a polygon
Area of polygon
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