Likewise, for the third side of the triangle, there are four lines left to choose from. Thus, the total number of ways you can choose the sides of the triangle equals 6 × 5 × 4, or 120. Clearly ...

If you’ve been playing Hogwarts Legacy for any lengthy of time, you have probably run into one of the above puzzle doors with triangles and numbers and symbols on them.

Another puzzle starts with coins arranged in a closely packed triangle. The problem is to turn the triangle upside down, sliding coins so that a single coin abuts two other coins.

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