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What length of solid cylinder 2 cm in...

What length of solid cylinder 2 cm in diameter must be taken to cast into a hollow cylinder of external diameter 12 cm, 0.25 cm thick and 15 cm long? (a) 42.3215 cm   (b) 44.0123 cm  (c) 44.0625 cm  (d) 44.6023 cm

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