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| 1. |
\left. \begin{array} { l } { \text { Find the value of } \sqrt { s ( s - a ) ( s - b ) ( s - c ) } } \\ { a = 15 , b = 18 , c = 12 , \text { and } s = \frac { 1 } { 2 } ( a + b + c ) } \end{array} \right. |
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