Question

If A = {1, 2, 3, 4, 5, 6, 7, 8, 9} and B = {3, 6, 9, 12, 15, 18}, what is A union B?

Answer 1

make a list
if the number is in A, put it in the list
if the number is in B, put it in the list
just don't repeat any
i.e. only put it in once

Answer 2

Okay , So If A & B have say , 3 do i put it in A's side or B's side ?

Answer 3

make a list like this
\[\{\text{ stuff goes here}\}\]

Answer 4

there is no "side" it is just a list
written like A or like B

Answer 5

the A U B(thats union).is a set that consists of all the elements of A nd B...without repetion of any element...like u have 3 in both the sets...but it must be present only once in the set A U B...got it??

Answer 6

@satellite73 Mmkay ..
@amriju not really ._. this is why i hate math .

Answer 7

\[A\cup B=\{\text{ list of numbers }\}\]

Answer 8

so lets go slow, because once you know what it is asking you are going to be 'really is that all?"

Answer 9

\[\{\text{ we are going to put numbers here }\}\]

Answer 10

ok first u yhave to understand that for set A nd set B ... A union B is another set that we need to determine...denoted by A U B..got this much..??

Answer 11

Somewhat .. :/

Answer 12

ok well...we start from the beginning...do u know what an set is??

Answer 13

I haven't learned it since 8th grade , so no ..

Answer 14

ok...so do u need the answer or the do u want to understand the solution

Answer 15

Both . xD I want to understand it mostly .

Answer 16

ok...a set is a collection of something...anything...like a set of books refer to a collection of books...similarly u can have numbers..or words..eg A={1,54,69,85,14} is a set of numbers...Ur question consists of two sets with numbers in it..

Answer 17

if you have a bag of pretzels, and a can of walnuts; the union of the bag of pretzels with the can of walnuts creates a new set composed of all the elements of both containers. might be a good way of looking at a UNION of sets

Answer 18

Even { A, B, 9, 5, J} is a set...now we come to operations on sets...

Answer 19

\[\{\text{amistre, amriju, satellite, sceenie}\}\] is the set of people who are in this post

Answer 20

I see now ,

Answer 21

Now lets say u r going somewhere with the books by publishers A, B, C, D...on another day...u take books of Publishers B,C,D,E...now u dont have two books of the same publisher...so if I know this and I've seen u on both days...I can assert that u have books of publishers A, B, C, D, E...even though I've seen u carrying B, C, D on both days...now the collection of books refer to the sets...lets say X={ A, B, C, D} and Y= { B, C, D, E}...so X U Y is { A, B, C, D, E}..thats u dont repeat the items if they are present in both sets...but u include them only once...

Answer 22

Oh okay . I see now .

Answer 23

So can u work out the answer..?? post it here

Answer 24

I got {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 18}

Answer 25

correct dear..:)

Answer 26

Really ? C:

Answer 27

:)..u learnt it...Isn't it damn simple??