China Naming Network - Ziwei knowledge - 2020 Gaozhou Senior One Draw

2020 Gaozhou Senior One Draw

* * * There are 10 people in the population.

∴ The probability of class five being drawn for the first time is 1 10, and the probability of being drawn for the second time is 910×19 =110.

That is, a =110b =110.

So choose D.

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