Two similar but independent patterns has gotten one out of nine parts misplaced with the other pattern. What two figures (one in range a-i and the other in range 1-9) are the odd ones that should be switched to restore both patterns, and why?

Created by myself

  • $\begingroup$ With the odd-one-out tag and some other tag not in the top 50 most used tags, you could have entered this in the Fortnightly Topic Challenge #37 :) $\endgroup$
    – Mr Pie
    Commented Jul 16, 2018 at 0:55

1 Answer 1


Is it

e and 9?


I notice that taking each shape separately, they are reflected diagonally topleft-bottomright. So that suggests that the two squares that we need to swap are along the diagonal. Then I looked at the bottom diamond. I notice that swapping e and 9 results in this shape alternating + and x on both grids.

  • 1
    $\begingroup$ Great! You got it! :) $\endgroup$ Commented Mar 3, 2018 at 6:17

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