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]
Figurate number triangle
Bottles of beer
Back to basics 21 - Matrix replicating
Angle between Two Vectors
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
to the 2 all elements
Calculate the square root of a number
the average value of the elements
Calculate the average value of the elements in the array
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