Respostas

2014-06-08T10:43:00-03:00
4! = 4 x 3 x 2 x 1 = 24 ----------> correto
5! = 5 x 4 x 3 x 2 x 1 = 120
8! = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 40320
7! = 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040
9! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 362880

portanto...
4! é o correto 
2014-06-08T10:48:39-03:00
4! = 4 x 3 x 2 x 1 = 24
5! = 5 x 4! = 5 x 4 x 3 x 2 x 1 = 120
8! = 8 x 7 x 6 x 5! = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 40320
7! = 7 x 6 x 5! = 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040
9! = 9 x 8! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 =362880

Resposta certa : 
Letra a) 4!=24
1 5 1