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The sum of perimeters of the six face...

The sum of perimeters of the six faces of a cuboid is 72 cm and the total surface area of the cuboid is 16 cm2. Find the longest possible length that can be kept inside the cuboid (a) 5.2 cm        (b) 7.8 cm     (c) 8.05 cm      (d) 8.36 cm

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