The units are wrong. d is the distance (in metres) from each lens to the cogwheel (not the distance separating). X is in rps not rpm. The required speed of light is in m/s not km/s.
Find the peak 3n+1 sequence value
Magic is simple (for beginners)
Number of digits in an integer
Simple equation: Annual salary
Find and replaces spaces from a input string with *
Number of divisors of a given number
length of string on cylinder
Slicing the cube
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