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TN XII Math
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In the set of real numbers $R,$ an operation $^\ast $is defined by $a^\ast b=\sqrt{a^{2}+b^{2}}.$ Then the value of $(3^\ast4)^\ast 5$ is
\[\begin{array}{1 1}(1)5&(2)5\sqrt{2}\\(3)25&(4)50\end{array}\]
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