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Prove that f:X rarr Y is surjective iff ...

Prove that `f:X rarr` Y is surjective iff for all `B sube Y, f(f^(-1)(B)) =B.`

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USHA PUBLICATION-MODEL QUESTION SET-MODEL QUESTION SET
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  10. Evaluate the determinant abs((4,6,-2),(1,-4,3),(7,-2,1)

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