In this year's junior high school experimental examination in our county, students draw lots to decide their own examination contents, stipulating that each candidate must first have three physical ex

In this year's junior high school experimental examination in our county, students draw lots to decide their own examination contents, stipulating that each candidate must first have three physical experimental questions. (1) See the analysis for the results; (2) .

Test analysis: (1) List all situations in two steps;

(2) See how many questions and computer questions have odd subscripts.

Test analysis: (1)

;

(2) There are nine cases of * * * and four cases of odd subscripts, so the probability of finding is.

Test sites: list method and tree diagram method.