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.
Read a column of numbers and interpolate missing data
Check to see if a Sudoku Puzzle is Solved
Solving Quadratic Equations (Version 1)
Beginner's Problem - Squaring
A shooting competition
Geometrical meaning of determinant
Find the diagonal of the square of side L
Probabilities - More brains than luck
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