On 06/09/17 16:31, Ian Kelly wrote: > On Wed, Sep 6, 2017 at 1:37 AM, Marko Rauhamaa <ma...@pacujo.net> wrote: >> Which reminds me of this puzzle I saw a couple of days ago: >> >> 1 + 4 = 5 >> 2 + 5 = 12 >> 3 + 6 = 21 >> 8 + 11 = ? >> >> A mathematician immediately comes up with a "wrong" answer. > There are no "wrong" answers with these kinds of puzzles. There are > only answers with varying degrees of parsimony with the known facts. > > I say the answer is clearly "banana" because the key to the puzzle is > that everything matches a line from the following look-up table: > > 5 => 5 > 7 => 12 > 9 => 21 > 19 => banana
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