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Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).

Sets & FunctionsFunctions and Relations

If $f(x) = -1$, what is $f(f(-1))$?

A.$1$
B.$0$
C.$-1$Correct answer
D.Undefined

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Quick fact: Since $f(x) = -1$ for all $x$, we have $f(-1) = -1$ and thus $f(f(-1)) = f(-1) = $-1$.

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