IQ Brain Teaser #171
What should the last grid look like in the sequence below? (HINT: Think squares!)


If the boxes were numbered as follows:



the last grid would have

an X at 1 and an O at 7
an O at 3 and an X at 5
an O at 4 and an X at 6
an X at 8 and an O at 9
an O at 2 and an X at 4
an X at 3 and an O at 8
an O at 6 and an X at 8
an X at 2 and an O at 5
an O at 4 and an X at 9
None of the above are correct

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