Logical Thinking

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?




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The phrase “thinking outside the box” was popularised from the solution to a topographical puzzle involving 9 dots in a box shape.