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Question
What letter Should Come Next?
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: 1,1,1; 1,1,2; 1,2,2; 2,2,2; 2,2,3.



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