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Answer with Explanation:

External radius = 4 cm,

Internal radius = 3 cm.

Volume of iron
= (22/7 x [(4)2 - (3)2] x 21) cm3

= (22/7 x 7 x 1 x 21)cm3

= 462 cm3.

Therefore, Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
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