I need to show that A is a subset of B if and only if A union B is equal to B. Can somebody help me with this? Thanks
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Originally Posted by Scorpy6 I need to show that A is a subset of B if and only if A union B is equal to B. Can somebody help me with this? Thanks You need to show two things: 1. If $\displaystyle A \subset B$ then $\displaystyle A\cup B=B$ 2. If $\displaystyle A\cup B$ then $\displaystyle A \subset B$ Now what have you tried and what problems are you having? CB
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