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".
Read a column of numbers and interpolate missing data
Project Euler: Problem 1, Multiples of 3 and 5
vectorization in N
Scoring for oriented dominoes
Performance - summation
Find the diagonal of the square of side L
Non trivial identities - differentiation
Simple polynomial evaluation
Area of polygon
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