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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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Workings

Hint
Convert the letters to positions in the alphabet.

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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