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Mathematics 19 Online
OpenStudy (lizz123):

@Hero @robtobey @AriPotta @ParthKohli @perl Using exactly four 4's and any operation (+,-,*,/()), find an expression to equal 1,2,3,4,5,6,7,8,9,10

OpenStudy (anonymous):

http://mathforum.org/ruth/four4s.puzzle.html

OpenStudy (lizz123):

thx @robtobey

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