Remove the polynomials that have positive real elements of their roots.
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 19 - character types
Is it a number?
Is this triangle right-angled?
Create a matrix from a cell
Set the array elements whose value is 13 to 0
Generate a string like abbcccddddeeeee
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Combinations without using nchoosek
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