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.
Remove the small words from a list of words.
Are you in or are you out?
Find the maximum two numbers of every column of a matrix
Calculate the values of a polynomial.
Non trivial identities - flipping
Non trivial identities - differentiation
Non trivial identities - summation
Performance - summation
Probabilities - More brains than luck
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