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The inverse g of an invertible f : X → Y satisfies which pair of equations?
Agof = IX and fog = IY
Bgof = IY and fog = IX
Cgof = fog = f on X
Dgof = 0 and fog = 0
Answer & Solution
Correct answer: A. gof = IX and fog = IY
Applying g after f returns each element of X, and applying f after g returns each element of Y.
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