Which of the following letter number-clusters will replace the question mark (?) in the given series to make it logically complete?
FI31 EH39 DG47 CF55 ?
ABF63
BBE63
CBE64
DBF64
ABF63
BBE63
CBE64
DBF64
Related Questions:
What is the next number in the series? 0, 8, 24, 48, ------