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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- October 13th 2011, 11:11 AMScorpy6Problem with proving
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 :)

- October 13th 2011, 11:59 AMCaptainBlackRe: Problem with proving