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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 ()
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