## alyssa.wilkins.77

Hello,

I have been trying to make a logical expression that would give me a certain output(Y) from the given inputs(ABCD). The directions are not specific in how I get the output just that I do not simplify the logical expression

A B C D Y
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 1
0 1 0 1 1
0 1 1 0 1
0 1 1 1 1
1 0 0 0 0
1 0 0 1 0
1 0 1 0 0
1 0 1 1 0
1 1 0 0 1
1 0 1 1 1
1 1 1 0 1
1 1 1 1 1

Any help would be apprieciated

## rubberman 1,355

Not doing your homework for you, but will give a clue, think bit-wise comparisons based upon some bit of information in your "truth table".

## iamthwee 1,547

karnaugh mapping perhpas?

## mike_2000_17 2,669

I just wanted to point this out. There is a very important error in the truth table that you posted, it should be this:

``````A B C D Y
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 1
0 1 0 1 1
0 1 1 0 1
0 1 1 1 1
1 0 0 0 0
1 0 0 1 0
1 0 1 0 0
1 0 1 1 0
1 1 0 0 1
1 1 0 1 1  <--- notice this line (compared to original)
1 1 1 0 1
1 1 1 1 1
``````

Without that correction, there is no way that this could work. And with the correction, it becomes pretty obvious that only A and B matter, so, concentrate on that.

commented: Good catch Mike - did't look that far! :-) +12

## alyssa.wilkins.77

Yea. I was able to figure out was wrong, noticed the mistake on my lab and we have finally learned kmaps which I have been using.