For given positive integer n, take factorial of that number. How many trailing zeros does it have?
Example: factorial(11) = 39916800
Its last zero-digit count is 2.
Optional: Can you make an efficient algorithm for a very large n?
peta to nano (x-ray)
Return 'on' or 'off'
frame of the matrix
Volume of a box
Under the sea: Snell's law & total internal reflection
Equal temperament - musical notes and frequency
Number of paths on a n-dimensional grid
Number of even divisors of a given number
Make a rainbow matrix (follow-up to checkerboard matrix)
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