Home › Previous year questions › GATE 2021 PI › Question 3GATE 2021 PI – Question 3 General Aptitude · Spatial Aptitude: Spatial Reasoning and Visualization · 1 mark · Multiple choice
Find the least number of squares to add to the shown arrangement so P–Q becomes a line of symmetry.
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Show answer and explanation Correct answer: (C) 6
Explanation Reflect each shaded square across the vertical P–Q line. None of the six reflected positions is already shaded: the offset upper squares and four lower squares each need a partner. Adding their six mirror partners is sufficient and necessary. **6, C**.
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