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The diagram below shows a river system consisting of 7 segments, marked P, Q, R, S, T, U, and V. It splits the land into 5 zones, marked Z1, Z2, Z3, Z4, and Z5. We need to connect these zones using the least number of bridges. Out of the following options, which one is correct? Note: The figure shown is representative.

1. Bridges on P, Q, and T
2. Bridges on P, Q, S, and T
3. Bridges on Q, R, T, and V
4. Bridges on P, Q, S, U, and V

Correct answer: Bridges on P, Q, S, and T

Solution

The correct option includes bridges on segments P, Q, S, and T, which effectively connects all five zones with the minimum number of crossings, ensuring that each zone is accessible while minimizing the total number of bridges needed.

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