Question 38
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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 are there from A to B?
- A 6
- B 20
- C 5
- D 10 Correct
Correct Answer: Option D
Any route is 3 rights and 2 ups in some order
5!/(3! 2!) = 10
Trap: 6 multiplies 3 × 2.
Answer: 10
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