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?
Try 1.5.4: Celsius to Fahrenheit
Delete 2nd and 5th column of Given 6*6 matrix
Under the sea: Snell's law & total internal reflection
Number of paths on a 3d grid
The last non-zero digit of a factorial
Number of even divisors of a given number
Number of paths on a n-dimensional grid
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