A Pint?Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What letter/s is/are missing from this series?
O, A, B, ?
AnswerThis series is the four blood groups: O, A, B and AB.
See another brain teaser just like this one...
Or, just get a random brain teaser
If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.
Back to Top