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The number of ordered pairs $(\mathrm{m}, \mathrm{n})$, where $\mathrm{m}, \mathrm{n} \in\{1,2,3, \ldots \ldots, 50\}$, such that $6^{\mathrm{m}}+9^{\mathrm{n}}$ is a multiple of 5 is $-$
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The correct answer is:
1250
$\mathrm{m}$ can be any value and $\mathrm{n}$ will be odd number then sum is multiple of 5 $50 \times 25=1250$
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