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The volume of a rectangular solid is 210 cm3 and the surface area is 214 cm2. If the area of the base is 42 cm2, then the edges of the rectangular solid are (a) 3, 4 and 5 cm   (b) 4, 5 and 6 cm (c) 5, 6 and 7 cm    (d) 6, 6 and 8 cm

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