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Question

If a function f(x) is defined on [1,4][1,7] and given that f(3) = 5 and its inverse exists, then f1(f(5)) is .

A
equal to 3
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B
equal to 5
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C
not defined
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Solution

The correct option is C not defined
In the given problem we have to find f1(f(5)). If we look at the definition of given function it is defined on f: [1,4] [1,7]. The domain of f doesn’t have ‘5’ in it or we can say f(5) doesn’t exist. So f1 ( f (5) ) also doesn’t exist.

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