GRE考试

Aboxcontains100balls,numberedfrom

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试题来源:2012年新GRE数学考试模拟练习题(1)
【分析解答题】A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box,what is the probability that the sum of the three numbers on the balls selected from the box will be odd?
(A) 1/4
(B) 3/8
(C) 1/2
(D) 5/8
(E) 3/4

网考网解析:
解:本题因为奇数和偶数个数相同,和也只有两种方式,所以三个数的和为奇数的可能性为1/2。也可以考虑从... 查看试题解析出处>>

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