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Answer:
The missing letter in the series "a c e ? i" is "g".
The series follows the pattern of skipping one letter in the alphabet between each consecutive letter. Starting from "a", the next letter is "c" (skipping "b"), then "e" (skipping "d"), and the missing letter should be "g" (skipping "f"), followed by "i".
Therefore, the complete series is: a c e g i