Given an array, Find the sum of all of the elements in it
Input x = [1 2 3 5; 4 5 6 7];
Output y is 33
Project Euler: Problem 1, Multiples of 3 and 5
Create a vector whose elements depend on the previous element
Flip the vector from right to left
Replace every 3rd element in a vector with 4
Calculate square and cube of number
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