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.
Find the numeric mean of the prime numbers in a matrix.
Product of elements in row
Is It a Palindrome?
Area of a circle
Ratio between sum of primes and sum of factors
Double the next!
Get the mean digit
Get the value 100
Say type of roots in quadratic equation
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