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[Problem Solving]

试题详情

题目:

A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow.  If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?

选项:

A、3/64
B、1/20
C、1/16
D、1/12
E、1/8

答案:

B

提问:

请问徐小梅老师,这题我的计算是P=(C[1,4] ×C[1,3])÷ C[2,16]。请问我的过程哪里错了呢?

解答:

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阅读3266
解答: 徐小梅

提问:

请问徐小梅老师,这题我的计算是P=(C[1,4] ×C[1,3])÷ C[2,16]。请问我的过程哪里错了呢?

解答:

点赞0
阅读3267
解答: 徐小梅老师

提问:

第一个是red第二个是blue 难道不是1/4*3/16么?

解答:

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阅读3477
解答: 姜山老师

提问:

发现自己的理解和题目有歧义。

解答:

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阅读3346
解答: sysadmin老师

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