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**Hi,**

I'm new to this forum.

My problem led me here.

## Homework Statement

I need to solve this, using simplifying rules.

∫ = Ʃ(0,5,6,7,13)

But I always get one extra area when checking with Karnaugh map, which isn't necessary.

## Homework Equations

∫() = a' b' c' d' + a' b c' d + a' b c d' + a' b c d + a b c' d

## The Attempt at a Solution

Well I get always this as a solution, no matter the order i simplify

∫() = a' b' c' d' + b c' d + a' b c + a' b d

Now when applied to Karnaugh map the areas (equation parts from left to right 1-4) 1, 2, 3 are the solution I get when only using the map. But 4 overlaps with 2 and 3.

http://s8.postimage.org/dbo6zqrab/img.jpg [Broken]

If anyone has time to help me out, then please do.

**Thanks**

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