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\begin{array} { l } { \text { Three solid glass balls of radii } r , 6 \text { and } 8 \mathrm { cm } \text { are } } \\ { \text { melted into a solid sphere of radius } 9 \mathrm { cm } \text { . Determine } } \\ { \text { the value of } r . } \end{array} |
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