Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Are all the three given point in the same line?
Magic is simple (for beginners)
Vectors counting by 2
Create tangent function out of cosine only
Alternate list of elements
Ratio between sum of primer numbers and non-prime numbers
Check if is a square
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
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