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.
Distance walked 1D
Is the input divisible by 3?
sum of first 'n' terms
Create a Matrix of Zeros
find the mean of all elements in a matrix
Determine whether the input is divisible by 3 as well as 5
find a specific element from an matrix
modulus of a number
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