# truth table boolean logic

Discussion in 'Homework Help' started by fran1942, Nov 3, 2010.

1. ### fran1942 Thread Starter Member

Jul 26, 2010
58
0
Hello, I think out tutor gave us a faulty example, so I modified it as I thought correct.
Can anyone confirm if this truth table is a correct representation of the logic diagram ?

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2. ### haykp New Member

Oct 7, 2010
18
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I am afraid but I don't agree with representation of logic diagram.
the right one is Out = A+B

3. ### zgozvrm Member

Oct 24, 2009
115
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I haven't seen logic diagrams with symbols like this.

I assume the 2-input blocks with the $\ge$ are OR gates (outputs TRUE if either, or both inputs are TRUE).

Also, I'm guessing that the 1-input gate with the "1" inside and the inverted output is a NOT gate.

Obviously the gate with the "&" represents an AND gate.

If I am correct in the above assumptions, your logic equation is correct:
$\left( \overline{A + B} \right) + \overline{B}C$

...but your truth table is incorrect.

Apr 26, 2005
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5. ### Georacer Moderator

Nov 25, 2009
5,142
1,266
No, the truth table is wrong.

Be more careful when filling the truth table. Do you know how to do the process of filling the table?