Duplicate all elements in the array
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]
give nth decimal place of pi
Back to basics 6 - Column Vector
Doubling elements in a vector
Replace Nonzero Numbers with 1
Calculate the square root of a number
Convert characters into numbers
Find the max element of the array
the average value of the elements
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