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I don't get it. A friend asked ne this but I don't know what to say. I tried to see if it had to deal with integers or something, but I got nothing.

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    $\begingroup$ True for very large values of 3, or small values of 11 :D $\endgroup$
    – Irishpanda
    Nov 25, 2015 at 17:56
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    $\begingroup$ 11+1 = 12 = 1+2 = 3... Few people who beleives in astrology and numbers are sometimes use this trick to find their lucky number..!! Strange to listen, but true at some region..! $\endgroup$
    – H.Modh
    Nov 25, 2015 at 18:12
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    $\begingroup$ Have you considered that your friend might not know how to add? $\endgroup$
    – AvZ
    Nov 25, 2015 at 18:23
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    $\begingroup$ May be addition using Roman Numbers II + I = III $\endgroup$
    – Deepzz
    Nov 26, 2015 at 5:35
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    $\begingroup$ @H.Modh That's called the Digital-sum in math. $\endgroup$ Nov 26, 2015 at 10:20

2 Answers 2

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A rather simplistic solution

Your friend considers $1$ as a tally mark instead of a digit,
Hence $$||+|=|||=3$$

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  • $\begingroup$ Equally valid for roman numerals! $\endgroup$ Nov 27, 2015 at 13:58
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11 people, plus one more, equals 3 barbershop quartets!

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