I Speak only the Truth


I have one of the three numbers: 1, 2, or 3 in my mind. I speak only the truth. You can ask me just one question for which I will only reply in yes or no or don’t know. What question will you ask me so that you are able to know the number?

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  • 2 Answer(s)

    if 3 is dont know 2 is no 1 is yes then .What is the number?

    Yodha Expert Answered on 17th March 2022.
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    Please subtract 2 from the number and  tell is it greater then or equal to 0?

    silento Scholar Answered on 17th March 2022.

    It will NOT give you the number, because ‘Greater than OR equal’ gives two possibilities.
    1. Suppose the number is 2. Then, subtracting 2, you get 0, and the answer to your question (greater then or equal to 0) is YES.
    2. Let the number be 3. Then, subtracting 2, you get1.  Here again, the answer to the question remains YES.

    Thus, the answer ‘Yes’ does NOT help you to determine the number precisely.

    on 18th March 2022.
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