radius of a spherical planet
Is my wife right?
Back to basics 6 - Column Vector
Permute diagonal and antidiagonal
Sum the entries of each column of a matrix which satisfy a logical condition.
Number of paths on a 3d grid
Number of even divisors of a given number
The last non-zero digit of a factorial
Fractal: area and perimeter of Koch snowflake
Under the sea: Snell's law & total internal reflection
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