Current location - Zhou Gong's Dream Interpretation Encyclopedia Official Website - Divination by drawing lots - Draw lots from four people, A, B, C and D, and choose two people to clean, so the probability of selecting A and B at the same time is 16 16.

Draw lots from four people, A, B, C and D, and choose two people to clean, so the probability of selecting A and B at the same time is 16 16.

There are six possibilities: AB, AC, AD, BC, BD and CD, and two people are selected from A, B, C and D for cleaning by lottery.

So the probability of choosing both A and B is 16.

So the answer is: 16.

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