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mediumQ. No. 2489-find-the-missing-term-in-the-series-abc-bcd-cde-efg-139

Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)

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This bilingual Coding-Decoding question tests the exact transformation used in “Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)”. It requires the learner to align letter positions, identify the position-wise alphabetic progression shown by consecutive terms, apply the rule consistently and verify DEF against every position.

ADEF
BDFG
CDEG
DDFF
Correct Answer: DEFYour Answer: A

Explanation

The source working states: Each term shifts one letter forward alphabetically. This observation must be confirmed across every available letter position or every consecutive term before it is applied to the missing code. Applying the verified rule to the target expression produces DEF. The alternatives DFG, DEG and DFF fail because at least one position does not obey the same transformation. A useful final check is to map DEF backward through the inverse operation and confirm that the original target is recovered.

Important Notes

  • The exact rule used in “Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)” is the position-wise alphabetic progression shown by consecutive terms.
  • Question-specific verification: Each term shifts one letter forward alphabetically.
  • The codes DFG, DEG, DFF fail at one or more positions in “Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)”.
  • Apply the inverse rule to DEF and recover the target from “Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)”.

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FAQ

Coding Decoding FAQs

Common questions and clear answers for this topic.

What is the verified answer to “Find the missing term in the series: ABC, BCD, CDE, ?, EFG (139)”?

DEF, option A.

Which coding rule is applied?

The question uses the position-wise alphabetic progression shown by consecutive terms.

Why are the other options incorrect?

DFG, DEG, DFF violate the verified transformation at one or more positions.

How can the code be checked?

Apply the inverse transformation to the selected code and verify the original target.

What is Coding Decoding in Logical Reasoning?

Coding Decoding is a type of Logical Reasoning question where words or letters are coded in a specific pattern and you need to decode them. For example if CAT is coded as FDW then each letter is shifted by 3 positions. It is one of the most important topics in SSC CGL, Bank PO, IBPS, and Railway competitive exams.

What are the types of Coding Decoding questions in competitive exams?

Types of Coding Decoding questions: Letter Coding (letters replaced by other letters), Number Coding (words coded as numbers), Symbol Coding (letters replaced by symbols), Mixed Coding (combination of numbers and letters), and Coding by Analogy. All these types are asked in SSC CGL, RRB NTPC, and Bank exams.

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