find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Back to basics 8 - Matrix Diagonals
Back to basics 22 - Rotate a matrix
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find a specific element from an matrix
modulus of a number
find the mean of all elements in a matrix
Calculating selling price
Find remainder when x is divided by 3
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