Get off your ath, let’s do some math! Mind Your Decisions, a YouTube channel with 2.9 million subscribers, shared the above puzzle on Facebook and made the sensational claim that “only one in 1,000 can solve it.” The puzzle went viral as two seemingly correct answers emerged. The post that said only one answer is mathematically accurate has been viewed 9.5 million times and generated more than 46,000 comments.

Are you one in 1,000? Follow this link to the explanation.