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.
The Goldbach Conjecture
Convert a vector into a number
Number of digits in an integer
Side of an equilateral triangle
Volume of a box
Non trivial identities - summation
Non trivial identities - flipping
Find the diagonal of the square of side L
Simple polynomial evaluation
Remove collinear points in a set of 2D points defining a polygon
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