For P = {8 , 12 , 13 , 15 }, Q = {16 , 11 }, and R = {4 , 6 , 9 , 11 }, find P ∪ (Q∩ R).

the answer is ___

slim22 Sep 7, 2017

#1**+1 **

Q intersection R is { 11 }. Apologies,this site won't let me use intersection symbols.

P U {11 } is { 8 12 13 15 } U {11} which is

{ 8 11 12 13 15 } ,your answer.

You can also,and probably should,use set algebra for this. As below

P U (Q intersection R) = ( P U Q) intersection ( P U R) . You will get the same answer.

{ If anyone out there can tell me how to get maths symbols on this site,please do. This is getting quite frustrating. }

frasinscotland Sep 7, 2017

#2**+2 **

You can copy and paste the intersection symbol, like this one in the problem: ∩

If there is such a symbol for what you need, you can usually find it in a google search.

If you can't find one....you can use LaTeX to make most symbols. For example, typing " \cap " into LaTeX makes an ∩ . If you can't find the right symbol in the buttons at the top...the code you need might be in this post or this post.

hectictar
Sep 7, 2017