To determine the letter group that replaces the question mark in the analogy SMART : QJWMN : : DULL : ?, we need to follow the pattern of transformation between the letters of the words SMART and QJWMN.
Breaking down the pattern:
- S to Q: The letter 'S' moves two positions backwards in the alphabet to become 'Q'.
- M to J: The letter 'M' moves three positions backwards in the alphabet to become 'J'.
- A to W: The letter 'A' moves four positions backwards (considering wrap-around) in the alphabet to become 'W'.
- R to M: The letter 'R' moves five positions backwards to become 'M'.
- T to N: The letter 'T' moves six positions backwards to become 'N'.
Apply the same pattern to DULL:
- D to B: The letter 'D' moves two positions backwards to become 'B'.
- U to R: The letter 'U' moves three positions backwards to become 'R'.
- L to H: The letter 'L' moves four positions backwards to become 'H'.
- L to G: The letter 'L' moves five positions backwards to become 'G'.
Therefore, the letter group that replaces the question mark is BRHG.
The correct answer is BRHG.