Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Find all elements less than 0 or greater than 10 and replace them with NaN
Create a square matrix of multiples
Determine the number of odd integers in a vector
Sum of diagonals elements of a matrix
Get the value 100
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Double the next!
Alternate list of elements
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