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प्रश्न
Which of the following sets are equal?
\[A = \left\{ 1, 2, 3 \right\};\]
उत्तर
Two sets A & B are equal if every element of A is a member of B & every element of B is a member of A.
\[A = \left\{ 1, 2, 3 \right\}\]
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