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若有10道选择题,每题有A,B,C,D四个答案,只有一个正确答案,求随机作答恰好答对4道的概率为()。

单选题
2021-07-18 13:14
A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15999203717637285c10953f54a4c9c159bb57295c706.png">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1599920382426a56898611cb84ee3b007364645b57254.png">
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1599920393709a6df7304714f4727b1ee6f1d27db7804.png">
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1599920403507621e41441d4043c1b3ea9a382170e01a.png">
查看答案

正确答案
B

试题解析
B

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