Fascinating, and utterly unintuitive. This is a question that appeared on the American SAT test until it was recently removed. Every student ever has gotten it wrong, and that's because the SAT writers got it wrong too. Can you get it right? Please Register or Log in to view the hidden image! Spoiler: The correct answer is not listed at all. I guarantee that, even knowing this, you will get it wrong too. I sure did, and I can hardly believe it even after having been shown the correct answer. (Hint: It is an exact number; nothing approximate or irrational).