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GATE CSE 2024 Session 1 Q10: Fewest squares to add so that AB is a line of symmetry

Question

The least number of squares to be added in the figure to make AB a line of symmetry is

A dashed horizontal line A to B with two groups of unit squares: on the left a plus-like group with one square above the line and three below; on the right three squares below the line
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Answer: A (official GATE 2024 final answer key)

Concept used: Reflection symmetry about a line: every square needs a mirror image on the other side.

First step: Reflect each square across AB and count the reflected positions that are not already filled.

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Source: official GATE 2024 Session 1 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key

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