Add only the even numbers of x
x = [1 2 3 4 5]
the positive numbers are: 2 4, so their sum is 6
Number of toolboxes?
Back to basics 10 - Max Float
Create a square matrix of multiples
Given area find sides
Sum the squares of numbers from 1 to n
All odd - all even
Odd times 3
Add the positive numbers
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