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The Problem of the Sixth Week
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Someone likes 1234, but not 2460. He likes 1360, but not 2240. He likes 811, but not 110. What does he like?
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You may realize that for example 1234 consists of four digits (1, 2, 3, 4). If you add up those digits, you would get �10�.  For 1360, if you add up (1, 3, 6, 0), you would get �10�.  And the same for 811. In the contrast, the digits that make the numbers that he hates do not add up to �10�.  The only number that its digits add up to �10,� from the choices, is �64�
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