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.
Implement a ROT13 cipher
2 b | ~ 2 b
Sum of diagonal of a square matrix
Area of a triangle
Area of polygon
Geometrical meaning of determinant
Performance - summation
Remove collinear points in a set of 2D points defining a polygon
Probabilities - More brains than luck
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