Similar Triangles - find the height of the tree
04 - Scalar Equations 3
Replace Nonzero Numbers with 1
Replace values out of an interval with the lower or upper values
Number of even divisors of a given number
Smallest n, for n! to have m trailing zero digits
Number of paths on a n-dimensional grid
Fractal: area and perimeter of Koch snowflake
Under the sea: Snell's law & total internal reflection
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