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It is: 9*9*9 = 729
729, cube of 9 and square of 27
27 3x3x3 = 27
9
To square a number you multiply it by itself, to cube a number you then multiply itself twice! i.e. 3 times 3 is 9 and 9 times 3 is then 27 so 27 is 3 cubed