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@ @@@óáÕÜa@óïÝibÔ

12 ( )                      13 ( )         A + M +C

                                          14 ( ) 15 ( )          )
                                           [AMC10B 2006] (

                      S = 7 !+ 8!+ 9!+ ... + 2006!

6( )                        4( )          3( )       1 ()

                             <n >         [AMC10A 2008] (        )
                                                                 )
        <<< 6 >>>            .n           n                      )

32 ( )                      24 ( )        12 ( )     6 ()

                      70 60                  [AHSME 1971] (

                                                    248 −1

        65 61 ( )                         63 61 ( )

        67 63 ( )                         65 63 ( )
                                          [AHSME 1970] (
13511

       . r m 14589 13903

   108 ( )                  98 ( )                  m

        3             45678 ( )             49 ( ) 28 ( )        )
                                            [BritishJMC 1997] (  )
567890 ( )                                3456 ( ) 234 ( )
                                            [BritishJMC 1997] (
               86x y
                      x +y          .5    43
     9( )
                            7( )              6( )   4 ()

                                                     ٢٨
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