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".
We love vectorized solutions. Problem 1 : remove the row average.
Area of rhombus
Area of an equilateral triangle
Probabilities - Balls and urns - 02
Performance - summation
Remove collinear points in a set of 2D points defining a polygon
Find the diagonal of the square of side L
Probabilities - More brains than luck
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