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Math Help - logic

  1. #1
    Junior Member
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    logic

    ive got a circuit diagram for which i need to make a truth table, the diagram is attach to the question


    ive tryed to make the truth table but i am not sure if it is right, this is what i have come up with

    A B Out
    0 0 1
    0 1 1
    1 0 0
    1 1 0
    Attached Thumbnails Attached Thumbnails logic-11.jpg  
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  2. #2
    Super Member Failure's Avatar
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    Quote Originally Posted by srk619 View Post
    ive got a circuit diagram for which i need to make a truth table, the diagram is attach to the question


    ive tryed to make the truth table but i am not sure if it is right, this is what i have come up with

    A B Out
    0 0 1
    0 1 1
    1 0 0
    1 1 0
    No, that's not quite right. Consider: Input A goes directly to one of the inputs of the or-gate. Thus Out will be 1 if A is 1: so the last two entries for Out in your table should both be 1 (not 0).
    Otherwise, if A is 0, then all depends on whether the second input of the or-gate happens to be 0 or 1. Since B gets inverted before it is fed into this second input of the or-gate you find that Out is 1 if B is 0.

    To sum up, the truth table, as I see it, should be
    A B Out
    0 0 1
    0 1 0
    1 0 1
    1 1 1
    So only the first row of your truth table was correct.
    Last edited by Failure; August 2nd 2009 at 10:27 AM.
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  3. #3
    Junior Member
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    thanks for the help failure
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