2,2,6,12,27,()
A.42 B.50 C.58.5 D.63.5
27 18 1/3 6 2 12 ()A 26 B 24 C 22 D 20
:2/3,4/9,6/27,() A.1/9B.8/81C.10/81D.12/81
1 2 3 4 () 9 8 12 18 27 A.6 B.7 C.10 D.11
1 2 3 4 () 9 8 12 18 27A.6 B.7 C.10 D.11
2,2,6,12,27,()A.42 B.50 C.58.5 D.63.5
2/3,4/9,6/27,() A.1/9B.8/81C.10/81D.12/81