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  • Puzzle of the 3 light switches

    Ankita Katdare

    Administrator

    Updated: Oct 24, 2024
    Views: 1.5K
    In the basement there are 3 light switches in the off position.
    Each switch controls 1 of 3 light bulbs on the floor above.
    You may move any of the switches, but you may only go up stairs one time.
    How can you determine which switch controls each light?
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Replies

  • Saandeep Sreerambatla

    Member • Jan 5, 2011

    This is one of the interview question when I was a fresher.

    Answer:

    Let the switches be S1, S2, S3.

    Switch on S1 wait for 10 mins, Switch off S1 and Switch on S2.

    Go to the floor, the one which is glowing corresponds to S2, fell the other two.
    The one which is hot will be s1 and the other will be S3.
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  • shreyasm89

    Member • Jan 8, 2011

    @ES- Nice answer. Is that the only solution?
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  • Saandeep Sreerambatla

    Member • Jan 9, 2011

    shreyasm89
    @ES- Nice answer. Is that the only solution?

    I am not very sure, but this is the only one I said 😀 after getting a clue called you need to understand the principle of a bulb, it glows and .... it gets hot 😀
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