given a matrix, just find the mean of all elements in the matrix
easy problem just try
Project Euler: Problem 6, Natural numbers, squares and sums.
Sum the numbers on the main diagonal
length of a vector
UICBioE240 problem 1.13
Find remainder when x is divided by 3
Determine whether the input is divisible by 3 as well as 5
multiply an array by its position number
modulus of a number
first element of matrix
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