All odd numbers in x are added, while all even numers are subtracted from this.
x = [1 2 3 4 5];
y = +(1+3+5)-(2+4) = 3
Create a Multiplication table matrix...
Magic is simple (for beginners)
Given a 4x4 matrix, swap the two middle columns
Sort the vector with the given index
Solving Quadratic Equations (Version 1)
Second smallest number
How many complete pizzas (number 2)
Add the even numbers
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