Xiao Liang and Xiaogang signed up for the 100 meter dash in the school sports meeting.

Method 1: There are nine possible situations (a, A)(A, B)(A, B)(A, C)(B, A)(B, B)(B, C)(C, A)(C, b c) * *.

So the probability of being exactly assigned to a group (a, A)(B, B)(C, c) is 3/9= 1/3.

Method 2: p = (3x1)/(3x3) =1/3.

I hope it helps you!