Question

For which operations is the set {–1, 0, 1} closed?

Choose all answers that are correct.

A.
addition

B.
division

C.
multiplication

D.
subtraction

Answer 1

@iGreen

Answer 2

A and C ?

Answer 3

I think that your set is a Group if and only if we set as Group operation A., namely addition, whose properties are the properties of addition between real numbers. Please check the definition of Group wihth my answer

Answer 4

@Demonx341

Answer 5

so the answer is just a?

Answer 6

that's right! if closed set means mathematical group

Answer 7

@Demonx341 I think so, namely your closed set are Mathematical groups

Answer 8

my teacher said that Multipying would also be included.

Answer 9

@Demonx341 yes I think so, also multiplication has to be included in your answer

Answer 10

so the answer is Just A and C?

Answer 11

that's right!