DEF DEF2 DE2F2 ____

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Direction: Fill in the blanks in the middle of the series.

DEF DEF₂ DE₂F₂ _____ D₂E₂F₂

1. DEF₂
2. D₂EF₂
3. D₂E₂F
4. D₂E₂F₂

Correct 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.}