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 8 - Matrix Diagonals
Matlab Basics - Pick out parts of a vector
Sum of a geometric series
Double the next!
Ratio between sum of primes and sum of factors
Check if is a square
Alternate list of elements
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