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NIELIT 2019 Feb Scientist C - Section C: 11

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ans :-- option C

surface area :-- 4 * pie * R^2

volume :-- 4 * pie * R^3 / 3

percentage = 4 * pie * 10 * 10 *100 / (4/3) * pie * 10 * 10 * 10

                  = 30 %
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