Find three positive numbers x, y, and z whose sum is 27 and product is a maximum. a. x=4.5, y=4.5, z=18 b. x=y=z=9 c. x=6.75, y=6.75, z=13.5 d. x=3.6, y=5.4, z=9 e x=1.8, y=10.8, z=14.4

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