Let A be the set of students who live within one kilometer of school and let B be the set of students who walk to classes . Describe
1) A-B
2) A∪B
How am i supposed to represent A and B?
Set Description Problem without any of the elements enumerated/described
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elementary-set-theory
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1union means "or" and $A - B$ is "A and not B". – 2017-01-26
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0Represent them using words involving students, whether or not they live close to school, and whether or not they walk to class. For example $A\cap B$ is the set of students who simultaneously live within one km of school and walk to classes. – 2017-01-26
1 Answers
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You can write same as given in question -
A is the set of students who live within one kilometer of school.
B is the set of students who walk to classes.
Then,
1.) $A \cup B$ is the set of all students who live within one kilometer of school or who walk to classes.
2.) A - B is the set of students who live within one kilometer of school, who not walk to classes.