Discussion

What should come next in the following letter sequence?
A A B A B C A B C D A B C D E A B C D

Answer: B

Correct answer: E

The series is built of blocks that grow by one letter each time, each starting again at A:

A | A B | A B C | A B C D | A B C D E | A B C D ...

The final block has reached A B C D and is the sixth, so it must run to F. The next letter after D is therefore E.

Recognising the block structure is the whole of the problem; the letters within each block are simply the alphabet from the start.

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