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.
The sum of the numbers in the vector
Vector Magnitude Calculator
Compute LOG(1+X) in natural log
Divisible by 2
Calculate area of sector
Determine whether the input is divisible by 3 as well as 5
Find remainder when x is divided by 3
modulus of a number
Find the last digit
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