(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[PLAIN]http://img340.imageshack.us/img340/7690/123rk.gif [Broken]

2. Relevant equations

The answer should be A'C' + A'D'

3. The attempt at a solution

Shown in above in the question.

I want to know how can i get the correct answer. As you see above, in my last step, I wonder whether B'+BD and B'+BC are equal to 1 ? If so, then I can get the answer. But if dont, where is my problem?

Thanks.

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# Homework Help: Simplify boolean algebra

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