There are currently 33 questions on Mensa's "Online IQ Test" which I took for fun. I correctly answered 32 questions and understand why they are correct, but there is one remaining question (to which I only know the answer to because answers are hardcoded in the page's JS) whose answer I do not understand.
Can someone explain to me why the following is correct (question 11)?
I'm not saying it shouldn't be correct - just that I don't understand why. I don't follow the progression at all.