Aqui está um truque "matemágico" interessante. Escolha seu dígito favorito, de 1 a 9. Multiplique-o por 9, e então multiplique o resultado por 12345679. Seu dígito favorito vai "magicamente" aparecer. Por exemplo, se 4 foi selecionado, multiplique 36 por 12345679 – resulta em 444444444.
(Here is an interesting "mathemagic" trick. Choose your favorite digit, from 1 to 9. Multiply it by 9, and then multiply the result by 12345679. Your favorite digit will "magically" appear. For example, if 4 was selected, multiply 36 by 12345679 – it results in 444444444.)
PCFilho
(fonte: Albert Beiler, Recreations in the Theory of Numbers, 1964)
This fact was featured on an episode of Square One TV (a show which ran on American public television stations from 1987 to 1992 and perhaps in reruns after 1992).
ResponderExcluirThat must have been a very nice TV show. :)
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