1,1,2,6,24,120, ()。
A.620
B.720
C.820
D.680
1,1,2,6,24,() A,25;B,27;C,120;D,125
1 1 2 6 24() A.11 B.50 C.80 D.120
:1,1,2,6,24,()。A.64B.78C.120D.136
1,-2,6,-24,() A.72 B.96 C.120 D.-120
1,1,2,6,24,()。 A.48B.96C.120D.144
1,1,2,6,24,()A.48B.96 C.120D.122