Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Right and wrong
Matrix of almost all zeros, except for main diagonal
Replace secondary diagonal elements of a square array
Area of square
Double the next!
Approximate the inverse tangent by power series
Check if is a square
Get the mean digit
Ratio between sum of primer numbers and non-prime numbers
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