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Which classic puzzle gave rise to the phrase think outside the box?

AThe Tower of Hanoi
BThe water jug problem
CThe Buddhist monk problem
DThe nine dot problem
Answer & Solution
Correct answer: D. The nine dot problem
1. In the nine dot problem, solvers assume the pen must stay inside the outer square. 2. The solution needs lines that go beyond that frame. 3. This produced the expression think outside the box; the other puzzles illustrate different ideas. _Source: Wikipedia, Problem solving, section Unnecessary constraints_
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