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'.
Project Euler: Problem 5, Smallest multiple
Sum of first n terms of a harmonic progression
Calculate Resistance 2
Ratio between sum of primes and sum of factors
Say type of roots in quadratic equation
Get the mean digit
Alternate list of elements
Sum of a geometric series
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