Look at the underlined words/sentences/clauses and choose the correct answer
Since he had no money, he postponed his journey.
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Explanation:
usual, prove it using the general heuristic that
X=YX=Y if and only if X⊆Y and X⊇Y.X⊆Y and X⊇Y.
In other words, take a generic element of A×(B−C)A×(B−C) and show that it also must be an element of (A×B)−(A×C)(A×B)−(A×C), and vice versa.
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