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".
Summing Digits within Text
select the primes of a vector
Convert Fahrenheit to Celsius
Are you in XY plane?
Simple polynomial evaluation
Area of polygon
Remove collinear points in a set of 2D points defining a polygon
A shooting competition
Geometrical meaning of determinant
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