JEE delight: Number of functions such that for every x there is exactly one y such that f(x)=f(y)

JEE delight: Number of functions such that for every x there is exactly one y such that f(x)=f(y)
JEE delight: Number of functions such that for every x there is exactly one y such that f(x)=f(y)
JEE delight: Number of functions such that for every x there is exactly one y such that f(x)=f(y)
JEE delight: Number of functions such that for every x there is exactly one y such that f(x)=f(y)

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