Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Angle between two vectors
Spot the outlier
Determine if input is a Narcissistic number
Length of the hypotenuse
Alternating 1´s and 0´s in a matrix
Ratio between sum of primer numbers and non-prime numbers
Say type of roots in quadratic equation
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
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