Look at the given series and find the connection between the letters.
What comes next in the sequence;
AF, BE CF, DI, FD, ??
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Substitute the letter with their respective numbers from the table below;
Let see what they give us;
AF = 16
BE = 25
CF = 36
DI = 49
FD = 64
So you see the pattern is actually of square of numbers from 4 to 8, so the next number will be the square of 9 which is 81.
Now representing 81 in terms of letters we get HA
Answer = HA