DEF, DEF2, DE2F2, _____, D2E2F3

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Question 1:

DEF, DEF_2,DE₂F_2,_____, D₂E₂F₃

DEF₃

D₃EF₃

C. .

D₂E₃F

D₂E₂F₂

Feedback 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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