세계 퍼즐 챔피온십에서 4차례나 우승한 경력이 있는 Google의 엔지니어인 Wei Hwa가 낸 퍼즐 문제 하나.
Using the numbers 3, 3, 8, 8 (in any order), make a mathematical expression that equals 24. You can use only addition, subtraction, multiplication, and division (and parentheses), but in any order you wish. Note that you have to use all four numbers; otherwise 3 times 8 would be valid -- and that wouldn't be much of a puzzle, would it? [Launch of Wei-Hwa's Puzzle Challenges by Google]
7-7-3-3과 5-5-5-1을 가지고 같은 방법으로 24를 만들 수 있다.
(via think again)