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?
Test for balanced parentheses
First non-zero element in each column
Return elements unique to either input
select the primes of a vector
Simple equation: Annual salary
rectangle in circle
Slicing the cube
How many rectangles in a grid ?
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