This series consists of two series . First series with the letters present in Even position that is A,C,E,G and second series with letters present in odd positions that is B,E,J,_ . upon careful observation of the odd positioned letter series the elements are having positions 2 5 and 10 . It means that between B and E 2 letters are missing and between E and J 4 letters are missing hence next letter must be Q . since between J and Q there are six letters in between .
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