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".
Back to basics 21 - Matrix replicating
Return unique values without sorting
Find out missing number from a vector of 9 elements
Pointwise multiplication of vectors.
Find the diagonal of the square of side L
Non trivial identities - reshape
Simple polynomial evaluation
Performance - summation
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