Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Angle between Two Vectors
Getting the indices from a vector
Removing rows from a matrix is easy - but what about inserting rows?
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Check if is a square
Get the value 100
Double the next!
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