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]
Find state names that end with the letter A
Get the area codes from a list of phone numbers
Reindex a vector
03 - Matrix Variables 5
calculate the length of matrix
Calculate the square root of a number
Find the max element of the array
the average value of the elements
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