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

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1,1,8,16,7,21,4,16,2,()A.10B.20C.30D.401,1,8,16,7,21,4,16,2,()A.10B.20C.30D.401,1,8,16,7,21,4,16,2,(

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

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