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.
Reverse the Words (not letters) of a String
vectorization in N
Whether the input is vector?
Concatenate two strings
Basic commands - Greatest common divisor
Non trivial identities - flipping
Area of polygon
Probabilities - Balls and urns - 01
Simple polynomial evaluation
Non trivial identities - reshape
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