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'.
Increment a number, given its digits
Project Euler: Problem 8, Find largest product in a large string of numbers
Back to basics 10 - Max Float
How to subtract?
Set a diagonal
Approximate the inverse tangent by power series
Alternate list of elements
Sum of a geometric series
Get the mean digit
Say type of roots in quadratic equation
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