Reviewing problem !!

Discussion in 'Homework Help' started by karantum, Sep 29, 2008.

  1. karantum

    Thread Starter New Member

    Sep 29, 2008
    I have a upcoming test regarding circuits and one of the things covered was a 4x4 bit binary circuit.

    I saw the wiki:

    but I can't figure out what is wrong with it (the comment says something is)

    Can anyone tell me (or redraw the circuit if you have a couple minutes) and explain what is wrong with it?