Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
radius of a spherical planet
Filter AC, pass DC
Sorted highest to lowest?
Calculate the height of an object dropped from the sky
Add 3 numbers
Ratio between sum of primer numbers and non-prime numbers
Check if is a square
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Double the next!
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