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CGP EDU Academic Team
Published on: August 14, 2026
If A = {1, 2, 3,4} and f : A → → A, the total number of invertible functions, ‘f’, such that f(2) ≠ ≠ 2, f(4) ≠ ≠ 4, f(1) = 1 is equal to
Text Solution
Verified by ExpertsThe correct answer is:
C
If f(2) = 3 then f(4) = 2, f(1) = 1, f(3) = 4. On the other hand if f(2) = 4 then f(4) = 3 or 2. Thus there are three invertible functions.
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