I have try a couple of time but I can't understand these problems. please help me to do it... I prochiate your support....
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Originally Posted by aRTx I have try a couple of time but I can't understand these problems. please help me to do it... I prochiate your support.... For a), let $\displaystyle A=\{1,2,3\}$ , $\displaystyle B=\{3\} $, $\displaystyle C=\{1, 2\}$, then: $\displaystyle A \cup B = B \cup C = \{1,2,3\}$ but $\displaystyle A \ne B $ This is also a counter example for b) and c) RonL
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