Re: [計量] If a bowl contains seven marbles ...
※ 引述《ELASTOMER (惡性循環........)》之銘言:
: 題目是
: If a bowl contains seven marbles, three red and four
: green, four marbles are drawn from the bowl at random
: without replacement. What is the propability that contains
: two red marbles and two green ones?
: 答案是18/35 不知要怎麼解,麻煩各位幫我解答一下,謝謝
C(3,2) x C(4,2)
_____________________
C(7,4)
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