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.
Return a list sorted by number of occurrences
Increment a number, given its digits
Right and wrong
Make one big string out of two smaller strings
Bottles of beer
multiply an array by its position number
find a specific element from an matrix
find the mean of all elements in a matrix
Determine whether the input is divisible by 3 as well as 5
Find the last digit
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