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                         A = 6 A + B = 12 B = 6

A = 10            . A = 10 A = 1     .B =2    .A ≠B

                                     .A =1

               1                            [Mandelbrot 3] (   )
1
                                     1

2523 ( )          2522 ( )        2521 ( )  10

                                               2520 ( )

                  .n                        :( )
.9 8 7 6 5 4 3 2
                                                         n −1

        3                   9

           .4 2                      8
               . 2×3= 6               32

75                             n −1                  .9 8

     .5×7×8×9     . n = 2521                n −1 = 2520

4n                                   [Mathcounts 1984] ( )

              5   73                 5            2

        140 ( )       138 ( )        130 ( )     128 ( )

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