yanyan
yanyan 發問於 科學及數學數學 · 3 年 前

probability?

Box A contains 5 cards numbered 1,3,6,8 and 10 respectively. Box B contains 4 cards numbered 2,3,6, and 9 respectively. A card is drawn randomly from box A and put into box B. Then two cards are drawn randomly at the same time from box B. Find the probability that the two cards drawn from box B are marked with the same number.

2 個解答

評分
  • ☂雨後晴空☀
    Lv 7
    3 年 前
    最佳解答

    P(two cards drawn from box B are marked with the same number)

    = P(3 or 6 is drawn from box A) * P(2 same cards(3,3 or 6,6) are drawn from box B)

    = 2/5 * (2/5 * 1/4)

    = 1/25

  • Hin Chung
    3 年 前

    1/50

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