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".
Find the numeric mean of the prime numbers in a matrix.
Knight's Tour Checker
Are you in XY plane?
Remove collinear points in a set of 2D points defining a polygon
Geometrical meaning of determinant
A shooting competition
Area of polygon
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