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]
Make a Palindrome Number
Prime factor digits
Find the maximum number of decimal places in a set of numbers
sum of non-primes
Square the input
Calculate the square root of a number
the average value of the elements
Convert characters into numbers
Calculate the average value of the elements in the array
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