Question and answer knowledge of Yangzhou traditional handling service

Eating zongzi on Dragon Boat Festival is a traditional custom of the Chinese nation. On the morning of the fifth day of May, grandma prepared four Wufangzhai zongzi for Xiaoming: a big meat zongzi, a red bean paste zongzi and two egg yolk zongzi. The four zongzi are all the same except the inner stuffing. Xiao Ming likes to eat egg yolk zongzi. The probability that Xiao Ming eats both zongzi is ().

1/2 b . 1/3 c . 1/4d . 1/6

Test center:

Probability formula.

Analysis:

According to the meaning of the question, firstly, the number of two identical cases among the four zongzi is obtained except that the internal fillings are different, and the two zongzi taken out are only one of them, and then the answer can be obtained according to the calculation formula of probability.

Answer:

Solution: According to the meaning of the question, choose two ***6 methods from four zongzi that are the same except for the different fillings inside.

Only in one case, the two zongzi taken out are egg yolk zongzi;

Therefore, the probability that Xiao Ming eats two zongzi with egg yolk is1/6; So choose D.

Comments:

This question examines the formula of probability, which is easy to make mistakes. We should carefully analyze the possible situations.

The knowledge points used are: probability = the ratio of the number of cases sought to the total number of cases.