What letter must replace the "(?)" in this finite sequence? Explain.

A, A, A, A, (?), A, A, A, A, A, A, __, __, __, __, __, __, A, __, ... , A.

Hint:
All "A"s are present, and the last "A" shown is the final letter of the sequence.

(In reply to re(2): Not quite a guess. by Leming)

Very good, Leming. 

The sequence does appear to be the final English alphabetic letter of the English name of each letter of the modern Greek alphabet.  This would give the sequence as:

A, A, A, A, N, A, A, A, A, A, A, U, U, I, N, I, O, A, U, N, I, I, I, A

with the fifth letter of the sequence, as noted, being "N".

Just a comment.  The Greek alphabet does have a "J".  It is also identified as the "I" -- IOTA. (Sometimes, to be distinct from iota, a diacritic, an inverted breve below, was used. This character is also known as yot).

Edited on August 28, 2008, 4:30 pm

Posted by Dej Mar on 2008-08-25 07:42:04