Find the minimum sum-of-products expression
f(a, b, c, d) = (maxterm numbers)(1, 2, 3, 4, 9, 15)
When I made a Karnaugh map for the maxterms, I came up with
(B+C+D')(A+B +C')(A+B'+C+D)(A'+B'+C'+D')
a) I think that's incorrect, perhaps due to my groupings of the 0's.
b) If my answer is in fact correct, I can't figure out how to put it into a product of sums form. I just applied DeMorgan laws on it, but I'm not sure that's correct either. Please help?
This is basically a maxterm expansion from a Karnaugh map (which I may or may not have grouped incorrectly) that I need in SOP

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- anonymous

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- anonymous

Maxterm(1,2,3,4,9,15)=Minterm(5,6,7,8,10,11,12,13)
so as u solve POS(Maxterm) for logic zero in K map , just solve SOP(Minterm) for logic 1 for the above stated equation to get the result in SOP or get the POS form in minimized form and get its dual relation that would convert the POS to the SOP...

- anonymous

Okay, so are you saying to map the ones out, and take the minterm off of them? Doing that, I got B'C'D' + ABC' + BC'D + A'BC + ABC' + AB'C.
Is that the correct answer to the problem?

- anonymous

Also, I think you forgot to include 0 and 14 in your list of minterms...?

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## More answers

- anonymous

Actually, I think I made a mistake. Is it B'C'D' + ABC' + BC'D + A'BC + ACD' + AB'C ?

- anonymous

ya i forgot to put in there there wud be 5 min term
B'C'D'+ABC'+A'BD+BCD'+AB'C

- anonymous

also the dual is not going to give us the correct expression we can find out the SOP by the same relation
Maxterm(1,2,3,4,9,15)=Minterm(0,5,6,7,8,10,11,12,13,14)

- anonymous

I don't think I see where A'BD would be. But I think I can see BCD' as a pair of ones. Can there be more than one correct answer?

- anonymous

does ur answer match |dw:1349874605579:dw| check the grouping..

- anonymous

Oh, I mapped it so that AB is on the top and CD is on the side. Lemme compare...

- anonymous

I'm still not sure how you got those pairings. I don't even have ones listed in some of those areas. We're mapping the minterms, right?

- anonymous

yup...the min terms (0,5,6,7,8,10,11,12,13,14)

- anonymous

|dw:1349875400799:dw|

- anonymous

That's the map I came up with. In a case like the bottom right horizontal grouping in the lowest row across, would it matter whether I grouped that one with the one on its left or right? Since it's in the middle of two 1s.

- anonymous

|dw:1349875843305:dw|
I numbered my rows/columns.

- anonymous

thats why u r getting wrong answer this should be done like this .....|dw:1349875916540:dw|

- anonymous

So you want to avoid overlapping groups if you can?

- anonymous

ya if there wud be overlapping the expression obtained is not in its minimized form ....and there wud be more number of minterms in the expressions..

- anonymous

Okay, so the final answer is B'C'D' + ABC' + A'BD + BCD' + AB'C?

- anonymous

Ohhh, I see. I had that backward. That overlapping was minimizing the expression.

- anonymous

Yeah, that makes sense. Thank you very much for your help. I wasn't sure if I was mapping correctly or not. Makes a huge difference, lol. :)

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