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.
Is the Point in a Circle?
Construct an index vector from two input vectors in vectorized fashion
Test if two numbers have the same digits
Number of digits in an integer
Simple polynomial evaluation
Area of polygon
Find the diagonal of the square of side L
Non trivial identities - summation
Remove collinear points in a set of 2D points defining a polygon
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