Ngày tải lên :
25/10/2014, 22:00
... 4( 2 x 1) x x x 0, x 4 4! 5! 4. 6! d) Đk: Z x, x 4: C4x C5x C6x (4 x)! x ! (5 x)! x ! 3.(6 x )! x ! 4! 5 .4! 4. 6.5 .4! 40 1 (4 x)! x ! (5 x) (4 ... 13, 31, 14, 41 , 15, 51, 23, 32, 24, 42 , 25, 52, 34, 43 , 35, 53, 45 , 54} b) A = {12, 13, 14, 15, 23, 24, 25, 34, 35, 45 } B = (21, 42 } C = Gv: Lê Hành Pháp Trang 10 TỔ HỢP & XÁC SUẤT 11 THPT Tân ... 14! 14! 14! x x x f) Đk: Z x, x 12: C 14 C 14 2C 14 1 2 ( 14 x)! x ! (12 x)!( x 2)! (13 x)!( x 1)! 1 ( x 1)( x 2) ( 14 x )(13 x) 2( x 2)( 14 x) (14...