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'.
Alphabetize by last name
Project Euler: Problem 9, Pythagorean numbers
Back to basics 21 - Matrix replicating
Return area of square
Rounding off numbers to n decimals
Sum of a geometric series
Alternating 1´s and 0´s in a matrix
Check if is a square
Ratio between sum of primes and sum of factors
Get the mean digit
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