Back to basics 21 - Matrix replicating
Given a 4x4 matrix, swap the two middle columns
Is this triangle right-angled?
The number of trailing zero digit of a factorial
Under the sea: Snell's law & total internal reflection
Smallest n, for n! to have m trailing zero digits
Fractal: area and perimeter of Koch snowflake
The last non-zero digit of a factorial
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