求老哥们解答此题(概率学)

Zeroes-avatar

Zeroes

2020-06-30T00:56:35+00:00

我觉得应该改选,这样中奖几率大
[img]https://img.nga.178.com/attachments/mon_202007/07/-7Q5-gadfK2qT1kSg0-sg.jpg.medium.jpg[/img]