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6. Select the image you want to add instead of the question mark.
  IQ test. Accurate and free online iq test # 4 with answers and solutions. Question # 6. Select the image you want to add instead of the question mark.
 

Explanation:
Each column and each line contain: one drawing with a gray square and two drawings with a black square; one black star and two gray stars; one star is turned sidewise; one small square of gray color and two black squares; two drawings with a circle and one drawing without a circle.