The urn contains B blue balls and R red balls. Each trial consists of drawing one random ball from the urn and observing its color. Then the ball is discarded.
What is the probability that, after N trials, the number of red balls is K?
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.
Which doors are open?
Project Euler: Problem 10, Sum of Primes
Rounding off numbers to n decimals
Concatenate two strings
A shooting competition
Non trivial identities - summation
Performance - summation
Non trivial identities - flipping
Probabilities - Balls and urns - 01
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