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

chilledz3non
Feb 9, 2016

#5**+5 **

∩ 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

#2**+5 **

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 ∧.

Guest Feb 9, 2016

edited by
Guest
Feb 9, 2016

#5**+5 **

Best Answer

∩ 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