In how many ways can cells in a 3 × 3 grid be shaded, such that each row and each column have exactly one shaded cell? An example of one valid shading is shown.

GATE 2023 Civil Engineering Q3 — Logical Reasoning

GATE 2023Set 2Q3MCQanswer keyexplanation soonmedium

Logical Reasoning · Permutations and Combinations

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Figure from the original GATE 2023 paper. (IIT Kanpur archive)

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Recurring concept

Permutations and Combinations has appeared in GATE Civil Engineering 5 times across 4 years (2018, 2021, 2023, 2024).

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