The solution to this problem doesn't make any sense!!!
If you are using the word "duplicate" to mean multiply by 2, then the correct answer is [2,4,6], not [1,4,6]
Reverse a string
Sum positive elements of matrix.
Sum two matrices
Find MPG of Lightest Cars
Converts numbers into characters
Find the max element of the array
Calculate the average value of the elements in the array
to the 2 all elements
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