A cylinder H cm high has a circumference of C cm. A string makes exactly N complete turns round the cylinder while its two ends touch the cylinder's top and bottom. How long is the string in cm?
Find common elements in matrix rows
Detect a number and replace with two NaN's
Number of digits in an integer
How many rectangles in a grid ?
Which way to go?
Recursive Standard Deviation
Number of divisors of a given number
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