Inference process of one interview question with a monthly salary of 30 thousand

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There are many online posts I don't know.

 

 

One interview question with a monthly salary of 30 thousand --- look at your IQ

Both Xiao Ming and Xiao Qiang are students of Mr. Zhang. The birthday of Miss Zhang is m month N. Both of them know the birthday of Miss Zhang.

It was one day in the following 10 groups. Mr. Zhang told James the m value and John the N value. Mr. Zhang asked them if they knew his birthday was that day?

March 4 March 5

June 4

September 1

December 1 December 2

1) James said: I don't know. I certainly don't know Xiaoqiang either.

2) Xiaoqiang said: I didn't know either, but now I know.

3) James said: Oh, then I know.

Determine the day of Miss Zhang's birthday Based on the conversation above.

 

The following is my inference process:

1) James said: I don't know. I certainly don't know Xiaoqiang. Remove the values that can be determined by N, that is, those with separate dates.

March 4 March 5

June 4

September 1

December 1 December 2

 

According to M, James can know that N cannot be used to determine, indicating that there is no separate date in the row corresponding to M, that is, 1 3 rows.

[March, September]

June 4

[March September 1, September 5]

December 1

 

2) In one row and three rows, Xiaoqiang can determine the date to indicate that the day is not a public item in the two rows.

This is not 5.

[March 4, March 8]

September 1]

 

3) James said: Oh, then I know.

At this time, one row is the only one that can be determined by m in September 1.

 

Extension

If 3) James said: Oh, I still don't know.

Then we can only judge that M is 3, and N is only known by Xiaoqiang.