Which values occur exactly three times?
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Find the dimensions of a matrix
The last non-zero digit of a factorial
The number of trailing zero digit of a factorial
Number of paths on a 3d grid
Smallest n, for n! to have m trailing zero digits
Under the sea: Snell's law & total internal reflection
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