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Question

If $R subset of A cross times B$ and $S subset of B cross times C$ be relations, then $open parentheses S o R close parentheses to the power of negative 1 end exponent equals$

$S^{- 1} o R^{- 1}$
$R^{- 1} o S^{- 1}$
$S o R$
$R o S$

The correct answer is: $S o R$

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