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.
Find the sum of all the numbers of the input vector
pressure to dB?
Calculate area of sector
Determine whether the input is divisible by 3 as well as 5
find the mean of all elements in a matrix
Calculating selling price
find a specific element from an matrix
Find the last digit
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