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Class 9 1 class math interest group
Xiaoming found that his birthday and Xiaogang's birthday were both in the same month.

It can be judged that the probability that two of the six students in Xiao Ming and Xiao Gang's math interest group have birthdays in the same month is 1.

But it doesn't mean that the probability that two out of six people have birthdays in the same month is 1.

His judgment is wrong.

So the answer is wrong.