There are 10 same balls in a bag, marked 1,2, respectively. 10. Each time you take a ball, record its number and put it back in the bag, then take the next one. This method is called "put back extraction". 3 balls are extracted and extracted, and the probability of the number of the 3 balls is even.

Filename	Size	Update
function proguji.docx	11090	2018-03-24

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