Practice problem
Commutative Property — Definition & Examples
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Below is a simple puzzle. The goal is to fill up the -box row with the given pieces. The number in front is the number of boxes.
Image source: by Christine
You have one of each colored piece. How many unique are there to arrange the pieces so they fill up the -box row?
hint: try putting down each at the left-most position, and see how arrangement you get each time.