Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Maintain shape of logical-index mask
Similar Triangles - find the height of the tree
Arrange vector in ascending order
Given area find sides
Create an index-powered vector
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Double the next!
Say type of roots in quadratic equation
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