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]
Reverse the Words (not letters) of a String
Matrix with different incremental runs
Generate pi using logarithm
Area of an equilateral triangle
Calculate the square root of a number
Convert characters into numbers
the average value of the elements
Converts numbers into characters
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