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".
Increment a number, given its digits
Back to basics 6 - Column Vector
Back to basics 22 - Rotate a matrix
Equal to their cube
Compute Fibonacci Number
Find the diagonal of the square of side L
Probabilities - More brains than luck
Simple polynomial evaluation
Probabilities - Balls and urns - 02
Performance - summation
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