Question

umm hi i need help with this math question before my test tommorow plzz help me fast

Answer 1

ok

Answer 2

r u going to help me

Answer 3

i can berlly understand u

Answer 4

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What would you like help on? I'll do my best to help :)

Answer 5

nice intro

Answer 6

Thanks ;)

Answer 7

Which of the following sets is closed under multiplication?



A.


{0, 1}


B.


{1, 2}


C.


{0, 1, 2}


D.


None of the sets are closed under multiplication.

Answer 8

this is wat i need help on

Answer 9

i have a test tm

Answer 10

hmm, I've never really learned this.
@shamil98 can you help?

Answer 11

oh is there like a boss of this website

Answer 12

there are multiple "boss" on this website, their profile pictures have a purple border ;)
shamil98 is just a really smart person :P

Answer 13

omg can u tell me whp all the bosses r

Answer 14

this is wat i need help on

Answer 15

lol thanks.
The entire set of whole numbers is closed under multiplication: The multiplication of two whole numbers equals another whole number.

Answer 16

Which of the following sets is closed under multiplication?



A.


{0, 1}


B.


{1, 2}


C.


{0, 1, 2}


D.


None of the sets are closed under multiplication.

Answer 17

who r the bosses name just 2

Answer 18

hartnn, hero

Answer 19

I'm not that experienced with number theory..
here is a good explanation.
Closed under multiplication means that any member of the set times any other member of the set (including itself) yields another member of the set.
Take {0,1} for example.
Note: 0×0 = 0, 0×1 = 0, 1×1 = 1

Those are all possible combinations and all yield a member of the set.

So, yes the set is closed to multiplication.

Now apply the same concept to the other sets, if you find on combination that yields something outside the set, then it is no closed.

Answer 20

is turning test 1 to

Answer 21

For example
(1,2)
is not a closed under multiplication
1 x 2 = 2
1 x 1 = 1
2 x 2 = 4 , 4 isnt inside the set so you can cross this out.

Answer 22

no, jigglypuff. lol.

Answer 23

kk i justt did it but i still dont get it

Answer 24

Basically
Whatever is in the parantheses when you multiply them by each other or themselves, THEY HAVE to yield one of the numbers.

Answer 25

who is @TuringTest

Answer 26

and @Hero

Answer 27

{0, 1, 2}
This one is not a closed set again because of the 2.
2 x 2 = 4
and it is not part of the set.

Answer 28

Only (0,1) is closed under multiplication.

Answer 29

um and this 1 too

Answer 30

please post each question separately

Answer 31

oh so (o,1) is the answrr

Answer 32

@jigglypuff314
Tbh, I just googled this and learned it haha :P

Answer 33

lol nice @shamil98

Answer 34

so is (0,1 right

Answer 35

Yes, do you understand the concept, though?

Answer 36

ty

Answer 37

a set is closed under addition if you can add any numbers in the set and NOT get a number outside the set
example {0, 1, -1} is closed under addition, because no matter how you add them you wind up with a number in that set

the definition is identical for closure under multiplication, only it applies to... you guessed it... multiplication instead of addition

Answer 38

this is the other 1 now

Answer 39

post it separately please!

Answer 40

As Turing said, please close this question, and open a new question :)

Answer 41

one Q per post, thanks ;)

Answer 42

ok i will do

Answer 43

ty u all