The radius of a hemisphere is 21 cm, what is its volume? (Take π = $\frac{22}{7}$)

The radius of a hemisphere is 21 cm, what is its volume? (Take π = $\frac{22}{7}$)
1). 38808 cubic cms
2). 9702 cubic cms
3). 19404 cubic cms
4). 29106 cubic cms

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