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Puzzle ZKNU 



??

Which letter is missing from this sequence:

B  C  E  G  K  Q  S  W

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Answer
M.

Reasoning
These are letters that occupy prime number positions in the alphabet:
B =  2
C =  3
E =  5
G =  7
K = 11
M = 13 *
Q = 17
S = 19
W = 23

 

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