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'.
Find all elements less than 0 or greater than 10 and replace them with NaN
Swap the first and last columns
Remove NaN ?
Doubling elements in a vector
Sum of a geometric series
Get the mean digit
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Double the next!
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