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".
given 3 sides, find area of this triangle
give nth decimal place of pi
Calculate distance travelled when given radius and rotations
Is it prime?
Back to Basics - Find no. of elements in a matrix?
A shooting competition
Probabilities - Balls and urns - 02
Area of polygon
Non trivial identities - summation
Non trivial identities - flipping
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