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                     17

                                              272

527 187 ( ) −17 ( ) 177 ( ) 17 × 34 17 ( )

             . 20, 16, 12, …                  n(               )
                                                               )
                         n . 60

11 ( )       9( )                   6( )      5 ()

                                                            (

1 , 1, 3, 9, … ( )                   10, 36, 62, 88, … ( )

3                                −15, − 2, 11, 24, … ( )
                                         [AHSME 1953] ( )
1, 1, 1 , 1 , … ( )
                              .
  234

                 .

2 5 ()       5+1 ( )                5 −1 ( )  1 ()

  5           2                      2
                 n
   t                                          {an } (          )
                      a3, at , a15                             )
9()                                         .Sn = 2n2 + 6n
    . 64     8( )
          .                         7( )      5 ()

                                            [MAΘ 2010] (

19 ( )            16 ( )              18          10 ( )
                                            [MAΘ 2009] ( )
             10                     13 ( )
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