Sets

[Mark Krasko]

1. How many ways can a Set A be represented?

Also:
A={6,8,18,25}
B={8,25,-3,-10}
U={-15,6,8,18,25,-3,-10} (Universal Set)

Which are true?
i. 8 is a element of A and -3 is not an element A intersect B
ii. {25} is element of B and {6} is a subset of A
iii. U union of A union B = U

 

[tutor_joel]

In order to understand how to answer these questions, you need a fundamental understanding of the terminology of sets. You can get a primer here.

Set A can be represented in any number of ways. so, if set A={6,8,18,25}, you can change the order of the number around in any combination. They do not have to be in numerical order.

A={6,8,18,25}
A={8,6,18,25}
A={25,8,18,6}

are all examples of A and they are all equal. How many more can you come up with?

An element is simply any part of a set. {18} is an element of A, so is {25, 6}

An intersection is any elements that two sets share. {8} is an intersection of sets A and B. {-10} is not.

This will get you started, Let me know if you have any specific questions after you look over the primer.