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.
Determine if input is odd
Reindex a vector
Rotate a Matrix by 90 degrees
Matrix to column conversion
Non trivial identities - flipping
Probabilities - Balls and urns - 01
Geometrical meaning of determinant
Find the diagonal of the square of side L
Non trivial identities - reshape
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