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".
First non-zero element in each column
Replace May with April
Rotate a Matrix
Generate a NaN...on purpose
Area of an Isoceles Triangle
Geometrical meaning of determinant
Simple polynomial evaluation
Remove collinear points in a set of 2D points defining a polygon
Performance - summation
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