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Question
DEF, DEF2, DE2F2, _____, D2E2F3
Options:
A .  DEF3
B .  D3EF3
C .  D2E3F
D .  D2E2F2
Answer: Option D
In this series, the letters remain the same: DEF.
The subscript numbers follow this series:
111, 112, 122, 222, 223, 233, 333, ...

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