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Volume of a cylinder = π × r² × h = (22/7) × 7 × 7 × 21 = 3234 m³ Volume of a cone = (1/3) × π × r² × h = (1/3) × (22/7) × 7 × 7 × 21 = 1078 m³ Difference = 3234 - 1078 = 2156 m³ Correct answer: a
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