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This is taken from a certain rather popular IQ test:

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Which of the four figure on the right completes the series on the left, and most importantly, WHY?

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I think it's ...

... the third symbol with the 7 points.

The first three symbols have 2, 3 and 5 points. These numbers are the first three primes. The next prime number is 7. (This answer doesn't say anything about how the strokes should be placed.)

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  • $\begingroup$ Why the difference between thick and thin lines? Arbitrary that vertical and horizontal are thin and diagonal are thick? And orientation is simply ignored... Really? $\endgroup$ – David G. Stork Mar 15 '17 at 0:37

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