Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-prime numbers lower than x.
test case #2 is not correct.
Most nonzero elements in row
Swap the input arguments
Create matrix of replicated elements
Rounding off numbers to n decimals
Get the mean digit
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
Alternate list of elements
Check if is a square
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