Probability of two white balls =1/c (5,2) =110.
A person's expectation of touching the ball =3/5+2/ 10=4/5.
Then 10 people's expectation = 10*4/5=8.
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1 1, the campus is silent and the classroom is absorbed. The teacher's footsteps were very light, and the students' pens didn't stop. After ten years of har