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Peter’s staircase Brainteaser

by David Shaw, 5 September 2018 | 0 comments

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Peter’s just finished building a new staircase up to the attic. It just fits along the four-metre-long wall of his lounge room, and it’s three metres tall. It has exactly 15 steps. Peter wants to have a carpet running along the staircase. How long does it need to be?

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