probability?

Question

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.

Answer 1

最愛解答

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

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Answer 2

1/50

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