Each of three friends knows whether the other two have passed or failed in an examination, but does not know his own result. The teacher comes and says, “At least one has failed”. If all three still does not know their own results which of the following is true?
Explanation:
If only one had failed than the person who had failed would have known that the other two had passed so he had failed. But the question states that no one still knows his own result.
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