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.
Will there be a new leader?
Output a vector which is table of 9
Remove the first, third and fifth rows of a matrix
Sum of adjacent elements in a vector
Draw a 'Z'.
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
Ratio between sum of primes and sum of factors
Sum of a geometric series
Check if is a square
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