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".
Remove all the words that end with "ain"
Back to basics 21 - Matrix replicating
Side of an equilateral triangle
Set x value to each even index of vector y.
Non trivial identities - differentiation
Probabilities - More brains than luck
Simple polynomial evaluation
A shooting competition
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