9000148902

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9000148902
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There are four paths from a city to the top of nearby mountain. Find the number of possible treks from the city to the mountain and back, if it is required to use one path up and another one down.
\(4\cdot 3=12\)
\(4\cdot 4=16\)
\(4 + 3=7\)
\(2\cdot 4=8\)