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Find A u B and A (upside down u sign) B for Set A and B A= {40,35,45,5}, B= {1-,30,15} A u B = ? or A u B is the empty set A (upside down u sign) B A (upside down u sign) B is the empty set HELP!!!!!

Mathematics
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The union of sets is the set that contains all the elements in the first set and the second set The intersection of sets is the set of elements that appear in both sets for example: if \(X=\{a,b,c\}\) and \(Y=\{c,d,e\}\) the ∪nion of \(X\) and \(Y\) is \(X\cup Y=\{a,b,c\}\cup\{c,d,e\}=\{a,b,c,d,e\}\) The i∩tersectio∩ of \(X\) and \(Y\) is \(X∩Y=\{a,b,c\}∩\{c,d,e\}={c}\)
So, do i use your example to solve >< sorry i never learned this
\[A= \{40,35,45,5\},\quad B= \{1-,30,15\}\] \[A \cup B = ?\]

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A U B = {40,35,45} U {45,30,15} ?
EXAMPLE NOT YOUR MATH PROBLEM intersection|dw:1368600603756:dw| WHAT HAPPENS TO INTERSECT C, D, E, F EVERY THING THAT HAPPENS TO INTERSECT IN THE AREA DENOTED BY AREA MARKED ( a) IS THE INTERSECTION OF C, D, E, F UPSIDE DOWN U
i dont get that
oh ok...
So, what I got as an answer is it correct? Do I just plug what is a,b,c, d...etc?
AUB={1,-30,15,35,45,40,5}
its 10...
|dw:1368601433801:dw||dw:1368601675484:dw|
|dw:1368602059344:dw|
\[A= \{40,35,45,5\},\quad B= \{1-,30,15\}\] \[A \cup B = \{40,35,45,5\}\cup\{1-,30,15\}=\]
|dw:1368602785826:dw|
|dw:1368603108968:dw|
|dw:1368603175678:dw|

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