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passive_fist comments on Innate Mathematical Ability - Less Wrong
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That's interesting! I got the same answer but I visualized it differently. (Imagine, for each possible subpattern, i.e. "plus shape" or "dots", considering which items it appears in. In each case the answer is four, forming a rectangle. Two of the rectangles should extend into the ninth item, the one we're looking for.)
The way I solved the problem hasn't been mentioned here by anyone, which is slightly bugging me out.
The way I solved it was looking at the whole puzzle as a single picture. The two bottom rows (except for the middle column) have pluses. Thus the solution must have a plus. The two right columns (except for the middle row - a transposed pattern from the previous pattern) have squares; the solution must have a square. There's only two answers with both a square and a plus; I picked the one that seemed most intuitively correct.