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'.
Back to basics 16 - byte order
Angle between Two Vectors
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Number of Even Elements in Fibonacci Sequence
Ratio between sum of primer numbers and non-prime numbers
Alternating 1´s and 0´s in a matrix
Approximate the inverse tangent by power series
Get the mean digit
Say type of roots in quadratic equation
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