There will be a class table tennis competition in the eighth grade of experimental middle school. Each class must send a pair of mixed doubles players to participate. Class 1, Grade 8 will be in a pri

There will be a class table tennis competition in the eighth grade of experimental middle school. Each class must send a pair of mixed doubles players to participate. Class 1, Grade 8 will be in a primary school. Draw a tree diagram according to the meaning of the question as follows:

* * * Composition scheme 6 pairs (Xiaoming, Xiao Juan) (Xiaoming, Xiao Min) (Xiaoming, Xiaohua) (Xiao Qiang, Xiao Juan) (Xiao Qiang, Xiao Min) (Xiao Qiang, Xiaohua);

(2)*** There are six combinations, and the probability of choosing Xiao Min and Xiao Qiang to participate in the competition is 16.