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# ​ Need help with Algebra 2 problems?

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Hey, could someone explain what these symbols are? I came over these problems while reviewing Algebra 2 Feb 9, 2016

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∩  means "intersection"......it is defined as the set of all the elements common to some n sets

U  means "union".......it is  the set composed of all the elements of n sets

A  =  { 1,2,3,4}

B = { 2,3,5, 6}

C = {3,4,6,7}

So.....B ∩ C  =  { 3, 6 } = {6, 3} [ the order doesn't matter]     "A"  is the answer

And  C U A  = { 1,2,3,4,6,7}   "E"  is the answer   Feb 9, 2016

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Introducing Math Symbols for Union and Intersection.  “There are two sets of symbols for 'union' and 'intersection'. One is the ∪ (union) and the upside down ∩ (intersection), and the other set is the ∨ and the ∧.

Feb 9, 2016
edited by Guest  Feb 9, 2016
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Thanks so much guys

Feb 9, 2016
#5
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∩  means "intersection"......it is defined as the set of all the elements common to some n sets

U  means "union".......it is  the set composed of all the elements of n sets

A  =  { 1,2,3,4}

B = { 2,3,5, 6}

C = {3,4,6,7}

So.....B ∩ C  =  { 3, 6 } = {6, 3} [ the order doesn't matter]     "A"  is the answer

And  C U A  = { 1,2,3,4,6,7}   "E"  is the answer   CPhill Feb 9, 2016