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I tried taking the Mensa practice test. One of the question involved completing a series of figures with the most logical option. This is the base sequence:

BaseSquence

And we have to choose the additional figure from these four options:

Four Options

I chose correctly, but admittedly did it mostly intuitively. I'd like to understand why the correct answer is:

Option 2: The three small black triangles

The only reasoning I could come up with seems dubious at best:

Alternance of shapes and lines; avoiding repeating figures; first two figures don't have angles, third does, so fourth should too.

Is there an obvious explanation that I'm missing here?

Reference to the full test (requires to provide an email address for results): http://mbe.webfactional.com/members/cgi-bin/preTest/preTest_v3.cgi?lang=fr

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closed as primarily opinion-based by JonMark Perry, Fabich, Deusovi, manshu, Gordon Allocman Jun 13 '16 at 20:56

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Looks to me like it's just a bad question. $\endgroup$ – f'' Jun 13 '16 at 14:43
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    $\begingroup$ I've VTC as "primarily opinion-based" because 3 random pictures does not make a pattern : answers will be based more on opinion than logic $\endgroup$ – Fabich Jun 13 '16 at 16:06
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    $\begingroup$ Wow, that's a horrible question. $\endgroup$ – Deusovi Jun 13 '16 at 16:06
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    $\begingroup$ @Lordofdark I agree that the IQ-test question itself is worthy of closure, but the question here is actually a good one: "Please explain to me why this puzzle's solution is what it is." It's completely within the scope of this site. (There's even a tag for it: explanation.) $\endgroup$ – GentlePurpleRain Jun 13 '16 at 20:12
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    $\begingroup$ This isn't a matter of opinion. The triangles are the most logical. Each of the other 3 options are mirror images of the 3 figures in the sequence. $\endgroup$ – Aaron Dietz Jun 13 '16 at 21:48

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