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]
Return the 3n+1 sequence for n
Back to basics 20 - singleton dimensions
Number of Horns on a unicorn!
Converts numbers into characters
Convert characters into numbers
calculate the length of matrix
Calculate the average value of the elements in the array
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