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 state names that start with the letter N
Specific Element Count
What number has this problem?
Is this triangle right-angled?
Find the diagonal of the square of side L
Remove collinear points in a set of 2D points defining a polygon
Probabilities - More brains than luck
A shooting competition
Probabilities - Balls and urns - 02
Simple polynomial evaluation
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