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'.
Figurate number triangle
Arrange Vector in descending order
Doubling elements in a vector
Sum the numbers on the main diagonal
Alternate list of elements
Ratio between sum of primer numbers and non-prime numbers
Sum of a geometric series
Approximate the inverse tangent by power series
Get the mean digit
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