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:
And we have to choose the additional figure from these 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