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'.
radius of a spherical planet
Use of regexp
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Create a vector
Ratio between sum of primes and sum of factors
Double the next!
Get the mean digit
Ratio between sum of primer numbers and non-prime numbers
Say type of roots in quadratic equation
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