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Each of the balls in a bag is red, or green, or blue. If one ball is to be removed at random, what’s the probability that the ba
Each of the balls in a bag is red, or green, or blue. If one ball is to be removed at random, what’s the probability that the ba
admin
2022-12-19
57
问题
Each of the balls in a bag is red, or green, or blue. If one ball is to be removed at random, what’s the probability that the ball will be green?
(1)There are 5 red balls and 4 blue balls in the bag.
(2)The probability that the ball will be blue is 1/3.
选项
A、Statement (1) ALONE is sufficient, but statement (17) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (16) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (17) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(17)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案
C
解析
Statement (1),包里面有5个红球,4个蓝球,但是不知道有几个绿球,所以无法回答问题。Statement (2),取出蓝球的概率是1/3,与绿球无关,无法知道绿球个数,也无法回答问题。把(1)和(2)结合起来,4个蓝球,取出蓝球的概率是1/3,那么一共有12个球,绿球数目=12-5-4=3,那么显然可以求取出绿球的概率。所以C为正确答案。
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GMAT QUANTITATIVE题库GMAT分类
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