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@ @óáÕÜa@óïÝibÔ@

. 1+1+1 + 1 n ()
237n

2 n ()
3 n ()
7 n ()

84 n ( )
. n n [AMC8 2007] ( )

11

28 ( ) 24 ( ) 20 ( ) 13 ( )

OM I [AMC10 2000] ( )
)
. I × M ×O = 2001

24 ( ) 99 ( ) 111 ( ) I + M +O

n(n +1) (n + 2) 671 ( )
n(

24 ( ) 8( ) 3( ) 2 ()
. 1, 1, 2, 3, 5, 8, 13, 21, ... [AMC10 2000] ( )

1

.

7() 6( ) 4( ) 0 ()

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