2,6,12,21,33,()A.37B.49C.47D.52
2,6,12,21,33,( )
A.37 B.49 C.47 D.52
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2,6,12,21,33,( )A.37B.49C.47D.52
2,6,12,21,33,( )
A.37 B.49 C.47 D.52