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Let $f : {1, 2, 3, 4, 5} \to {1, 2, 3, 4, 5}$ that are onto and $f (i) \neq i$ is equal to

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Correct option is B

Total number of functions= Number of derangement of 5 objects=5!12!−13!+14!−15!=44

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Let f:{1,2,3,4,5}→{1,2,3,4,5} that are onto and f(i)≠i is equal to

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Ready to Test Your Skills?

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Let $f : {1, 2, 3, 4, 5} \to {1, 2, 3, 4, 5}$ that are onto and $f (i) \neq i$ is equal to