promotion image of download ymail app
Promoted

中五數學題!求解答! (10點)

題目:The 5-seater in the last row of a bus is empty and 3 passengers is ready to sit on it. In how many ways can the seats be arranged so that 2 adjacent seats are reserved?

求step and answer!

2 個解答

評分
  • 5 年前
    最愛解答

    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)

    資料來源: The answer is 24
    • Commenter avatar登入以回覆解答
  • 5 年前

    ooxxx

    xooxx

    xxoox

    xxxoo

    四個情況,因此是 4 × 3! = 24。

    • Commenter avatar登入以回覆解答
還有問題嗎?立即提問即可得到解答。