The problem is ambiguously worded. The "number of red balls" is a constant, R, so it is unlikely to ever coincide with K (irrespective of the value of N). What should be found here is
"the probability that, after N trials, the number of observations of red balls is K".
Who Has the Most Change?
Back to basics 9 - Indexed References
middleAsColumn: Return all but first and last element as a column vector
Find out missing number from a vector of 9 elements
Area of polygon
Non trivial identities - summation
Probabilities - More brains than luck
Probabilities - Balls and urns - 02
Non trivial identities - flipping
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