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1. Which letter should replace the question mark?
  B E H K N ?
 

Explanation:
The sequence of letters: + 3 (in terms of the alphabetic order of letters). (B + 3 = E; E + 3 = H; H + 3 = K; K + 3 = N; N + 3 = Q).



- Your right answer.   
- Your wrong answer.   
Answer
- the correct answer.