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".
Knight's Tour Checker
Omit columns averages from a matrix
Add two numbers
Divisible by 10
Geometrical meaning of determinant
Probabilities - More brains than luck
Non trivial identities - flipping
Find the diagonal of the square of side L
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