0 Through 9These brain teasers rely on your ability to recognize groups of common attributes. For each of these puzzles you'll need to figure out why the words or letters are grouped as they are. Sometimes you will be asked to pick the odd-one-out or to place a new word into the correct group.
I have sorted the digits 0-8 into two groups:
Which group does 9 belong in?
Group A contains digits which can be the last digit of a square number. Group B contains digits which can't.
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