GATE 2024 MT – Question 10
The least number of squares to be added in the figure to make AB a line of symmetry is
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Correct answer: (A) 6
Explanation
Reflect each existing square across the horizontal AB line.
None of the six existing squares already has its reflected partner: the square above AB is in a column with a lower gap, and the five below AB also lack partners at their reflected heights.
Adding exactly those **six squares, A**, completes the symmetry.