When this problem was initially posted on Facebook, it included the claim that only one in 1,000 people could solve it.
The problem:
1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
8 + 11 = ?
What do you think the answer is?
The problem went viral and generated over 3 million comments with people arguing about the correct answer. What do you think the correct answer is?
Get an explanation of the solution.