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?
Number of digits in an integer
Calculate the derivative of a polynomial
Matlab Basics II - Minimum
Number of even divisors of a given number
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
Fractal: area and perimeter of Koch snowflake
Smallest n, for n! to have m trailing zero digits
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