1,1,8,16,7,21,4,16,2,( )A.10 B.20 C.30 D.40

问题描述:

1,1,8,16,7,21,4,16,2,( )
A.10 B.20 C.30 D.40

1*1=1
8*2=16
7*3=21
4*4=16
2*5=10
所以是10