Question

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

Choose all answers that are correct.

A.
addition

B.
subtraction

C.
multiplication

D.
division

Answer 1

@Hero

Answer 2

Or @ganeshie8

Answer 3

Would either of you help!!??

Answer 4

I assume that when a set is closed to an operation, it means, it is impossible to do the operation on the set?

Answer 5

@darkbeautystar

Answer 6

Ohh sorry

Answer 7

I am not sure....which is why I asked for help.. LOL

Answer 8

ok, assuming that, which is probably right, could you perform addition on the set {1,-1}

Answer 9

In other words, does {-1,1}+{2} make sense?

Answer 10

well i could search it up

Answer 11

http://math.stackexchange.com/questions/659128/set-addition-vs-set-union

Answer 12

Yes. Set addition is a thing.

Answer 13

Does {-1,1}-{1} make sense?
Yes! Set subtraction is a basic set operation!

Answer 14

So I add that on a calc

Answer 15

Good reading on this topic:
http://math.ucr.edu/~mcc/paper/ProcICCM05.pdf

Answer 16

Ok so addition and subtraction

Answer 17

Based on this question, (not entirely sure what they're asking), this would be my answer:
addition - yes
subtraction - yes
multiplication - can be done, but not as an operation so, no
division - same thing here, so no

Answer 18

Keep in mind, I am not sure of the nature of this question...

Answer 19

Ok thanks

Answer 20

No problem! Hope I helped!

Answer 21

Yep

Answer 22

If so, don't forget to leave a medal. I am 2 away from 50!

Answer 23

how do i do that

Answer 24

You just did! Thanks!

Answer 25

yep

Answer 26

*puppy fistbump*