Discrete Mathematics

Set Operations

Sets - Symmetric Difference

         

Consider the sets A={x∣−8<x<4,x is an integer}B={x∣−2<x≤11,x is an integer}.\begin{aligned} A &=\{x \mid -8 < x < 4, x \text{ is an integer} \}\\ B &=\{x \mid -2 < x \leq 11, x \text{ is an integer} \}. \end{aligned} What is ∣A△B∣? \lvert A \triangle B \rvert ?

Details and assumptions

You may choose to read the summary page Set Notation.

by Brilliant Staff

Consider two sets:

A={5,6,7,8,9,10}B={6,8,10,16,24} A = \{ 5, 6, 7, 8, 9, 10 \} \\ B = \{ 6, 8, 10, 16, 24 \}

What is ∣A△B∣ \lvert A \triangle B \rvert ?

by Brilliant Staff

Consider the sets A={1,2,a+7},B={a+3,a2,−a+10,16}.A=\{1,2,a+7\}, B=\{a+3, a^2, -a+10, 16\}. If A∩B={1,16},A \cap B=\{1, 16\}, what is the sum of all the elements in the set A△B?A \triangle B?

Details and assumptions

You may choose to read the summary page Set Notation.

by Brilliant Staff

If sets AA and BB satisfy A={23,11,55,6,4,18,37},A∩B={37,55},∣A△B∣=5,\begin{aligned} A & =\{23, 11, 55, 6, 4, 18, 37 \},\\ A\cap B & =\{37, 55\}, \\ \lvert A \triangle B \rvert & =5, \end{aligned} what is the sum of all the elements in the set B?B?

Details and assumptions

You may choose to read the summary page Set Notation.

by Brilliant Staff

If AA and BB are two sets such that ∣A∣=24,∣B∣=17,∣B−A∣=9,|A|=24, |B|=17, |B-A|=9, what is the value of ∣A△B∣? \lvert A \triangle B \rvert ?

Details and assumptions

You may choose to read the summary page Set Notation.

by Brilliant Staff
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