Solution for Cheryl's House Number Problem

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house number problem

Guardian

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Science

Did you solve it? The pals that broke the internet, ten years on

Summary

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Cheryl may have thought of 1 and 2 ( 1 x 2 = 2 ), or 3 and 4 ( 3 x 4 = 12 ), or 8 and 9 ( 8 x 9 = 72 ) So the sum a + b could be 3 , 7 , 17 etc. Bernard cannot know with 100 per cent certainty the value of a +b.