At a minimum, you should make this problem variable. For example, find the element at the ith row and jth column and define i and j in the test cases, which are passed along with the function.
Back to basics 7 - Equal NaNs
Back to basics 8 - Matrix Diagonals
Solve Linear equations
multiply by three
Sum of Two Numbers
find the mean of all elements in a matrix
modulus of a number
Find the last digit
Find remainder when x is divided by 3
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