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Bijection

GATE Data Science & AI · Discrete Mathematics - Permutations and Combinations · 2026-2026

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2026 Q33

The number of bijections f(.) from the set S = {1, 2, 3, 4} to itself such that f(f(n)) = n, for all n ∈ S, is __________. (Answer in integer)

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GATE Data Science & AI — Bijection PYQ Drill | PYQLabs