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'.
Number of 1s in the Binary Representation of a Number
High school cafeteria
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Approximate the inverse tangent by power series
Check if is a square
Ratio between sum of primes and sum of factors
Double the next!
Sum of a geometric series
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