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Which is the missing square in the following options?

Three by three grid of triangles, some inverted, some with a small circle, some with a vertical stem; the centre square is empty

  • A.Inverted triangle with a vertical stem above and below it
  • B.Plain inverted triangle
  • C.Inverted triangle with a small circle inside
  • D.Plain upright triangle

Answer: B

The missing square is (B), a plain inverted triangle.

Every row and every column holds one triangle with a circle inside, one triangle with stems at top and bottom, and one plain triangle, and each row has exactly one inverted triangle.

The middle row already has a stemmed upright triangle and an upright triangle with a circle, so it needs a plain triangle, and since the row has no inverted triangle yet, it must be inverted. The middle column confirms it: it has a stemmed triangle and a circled triangle, so it also needs the plain one.

(A) adds a second stemmed triangle and (C) a second circled one to the row, while (D) is plain but upright, leaving the row without an inverted triangle.

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