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".
Back and Forth Rows
Indexed Probability Table
Convert Fahrenheit to Celsius
Find sum of negative elements in row.
Find the diagonal of the square of side L
Area of polygon
Simple polynomial evaluation
Non trivial identities - reshape
Non trivial identities - differentiation
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