Question 24
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There are 3 roads from A to B and 4 roads from B to C. In how many ways can one go from A to C and back to A without using any road twice?
- A 144
- B 72 Correct
- C 12
- D 24
Correct Answer: Option B
Going: 3 × 4 = 12
Returning on unused roads: 3 × 2 = 6
12 × 6 = 72
Trap: 144 lets the same roads be reused.
Answer: 72
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