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".
Angle between two vectors
Construct an index vector from two input vectors in vectorized fashion
Edges of a n-dimensional Hypercube
Is the input divisible by 3?
Concatenate two strings
Non trivial identities - summation
Non trivial identities - flipping
Probabilities - Balls and urns - 02
Find the diagonal of the square of side L
Area of polygon
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