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? 發問時間： 科學及數學數學 · 1 個月前

Please answer the following question, thanks?

Attachment image

1 個解答

評分
  • 知足常樂
    Lv 7
    1 個月前
    最佳解答

    (a)

    C(7+13,1) × C(8+7,1) = 20 × 15 = 300

    (b)

    Number of cases where all items are from boutique A

    = 7 × 8 = 56

    The required number of cases that at least one item is from boutique B

    = 300 - 56 = 244

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