@ @pbjïØ Üa@ @QPX . 10 .C(12,2) = 12! = 66 2 !!× 10 ! ( ) [MAΘ 2008] ( ) 4 3 3: .C(5,2)×C(5,2)×C(6,2) = 10 ×10 ×15 = 1500 ) [MAΘ 2008] ( . . .C(5,2) = 10