China Naming Network - Almanac query - Xiao Zhang draws lots.
Xiao Zhang draws lots.
Solution: (1) Draw a tree diagram:
As shown in the figure, there are 16 possibilities for a classmate to draw lots;
(2)∵ Xiao Zhang draws two better experimental questions prepared by the subjects at the same time in four situations: 1B, 1C, 2B and 2C * * *.
∴ The probability that he draws the experimental questions prepared by two subjects at the same time is 4 16 = 14.