Question 39
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The map shows a grid of streets. A walker goes from A to B by a shortest route, moving only right or up along the streets.
How many shortest routes from A to B pass through the junction P?
- A 10
- B 6 Correct
- C 4
- D 3
Correct Answer: Option B
A to P: 1 right, 1 up → 2 routes
P to B: 2 rights, 1 up → 3 routes
2 × 3 = 6
Trap: 10 counts all routes.
Answer: 6
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