Respuesta :

choixongdong
11C7
= 11 x 10 x 9 x 8 x 7!/ (7!) (4! )
= (11 x 10 x 9 x 8 ) / (4 x 3 x 2 x 1)
= 7920 / 24
= 330

12P3
= 12 x 11 x 10 x 9! / (9!)
= (12 x 11 x 10)
= 1320

Otras preguntas