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?
Multiply 2 numbers
find radius of cone
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y equals x divided by 2
The last non-zero digit of a factorial
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Number of paths on a n-dimensional grid
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