Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Implement a ROT13 cipher
Bottles of beer
Back to basics 8 - Matrix Diagonals
Find nth maximum
Compare two input matrices
Ratio between sum of primer numbers and non-prime numbers
Check if is a square
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Get the mean digit
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