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".
Find the sum of the elements in the "second" diagonal
03 - Matrix Variables 2
Area of an Isoceles Triangle
Solving Quadratic Equations (Version 1)
I Plead the Fifth
Probabilities - More brains than luck
Remove collinear points in a set of 2D points defining a polygon
Probabilities - Balls and urns - 02
A shooting competition
Non trivial identities - flipping
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