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?
radius of a spherical planet
Triangle Numbers Below N
Back to basics 22 - Rotate a matrix
Flag largest magnitude swings as they occur
frame of the matrix
Number of divisors of a given number
How many rectangles in a grid ?
Recursive Standard Deviation
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