Answer of the question

91) . Volume of sphere = \frac{4}{3} {πr}^{3} [where r = radius] \Rightarrow 38808 = \frac{4}{3} {πr}^{3} \Rightarrow r^{3} = \frac{3}{4} \times 38808 \times \frac{7}{22} \Rightarrow r^{3} = 9261 \Rightarrow r = 21 cm

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