A globally renowned conditional reasoning test question. Exercises AI context memory and deductive reasoning through multi-step logical elimination. Suitable for LLM benchmark testing or fun IQ quiz content generation.
Xiao Ming and Xiao Qiang are Teacher Zhang's students. His birthday is Month M, Day N. They know it's one of 10 dates: Mar 4, Mar 5, Mar 8, Jun 4, Jun 7, Sep 1, Sep 5, Dec 1, Dec 2, Dec 8. Teacher Zhang told M to Xiao Ming, N to Xiao Qiang. Xiao Ming: "If I don't know, Xiao Qiang definitely doesn't know." Xiao Qiang: "I didn't know, but now I do." Xiao Ming: "Oh, now I know too." Deduce the exact birthday based on this dialogue.