1.

Meaning of durlabh in English​

Answer»

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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