中五數學題！求解答！ (10點）

We can consider the 2 adjacent seats (as the question required) to be "1 seat", so that the case equals to 3 passengers choosing 4 seats to sit.

The number of ways is then
= 4P3
= 4!/1!
= 24

(as the permutation of the 3 passengers counts as different ways)

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四個情況，因此是 4 × 3! = 24。