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I'd choose 1.
The number of areas separated by lines decreases from left to right.
4 2 1
8 4 2
3 2 ?
So only 1 fits this observation.
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Took me awhile to understand what you were saying. Now that I understand I have to agree that this is a very convincing pattern and decided to make an image so other people could more easily understand.
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this ignores the columns
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I don't see your point. The columns are symmetrical so if they had any effect it would be equal throughout and wouldn't change the answer.