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1. DEF, DEF2, DE2F2, _____, D2E2F3
The subscript numbers follow this series:
111, 112, 122, 222, 223, 233, 333, ...
Solution:
In this series, the letters remain the same: DEF.The subscript numbers follow this series:
111, 112, 122, 222, 223, 233, 333, ...