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 22 - Rotate a matrix
Replace all zeros and NaNs in a matrix with the string 'error'
Calculate the height of an object dropped from the sky
Divisible by 4
Double the next!
Ratio between sum of primes and sum of factors
Sum of a geometric series
Say type of roots in quadratic equation
Ratio between sum of primer numbers and non-prime numbers
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