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.
Sum of first n terms of a harmonic progression
Duplicate each element of a vector.
Create a vector
Sum of Two Numbers
Double the next!
Alternate list of elements
Get the value 100
Check if is a square
Alternating 1´s and 0´s in a matrix
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