Remove the air bubbles
Back to basics 20 - singleton dimensions
Getting the absolute index from a matrix
Replicate elements in vectors
Find a Pythagorean triple
Under the sea: Snell's law & total internal reflection
The number of trailing zero digit of a factorial
The last non-zero digit of a factorial
Smallest n, for n! to have m trailing zero digits
Number of paths on a n-dimensional grid
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