Question

if set A={1,1,2,3} B={1,1,5,7} is AintersectionB={1,1} or just {1} ? is AUB={1,2,3,5,7}

Answer 1

you would remove all duplicates, so A intersect B = {1}

Answer 2

and AUB = {1,2,3,5,7}, so you are correct there

Answer 3

oh okay so you remove all duplicates what if it was like probability? e.g. dice roll does it stay the same

Answer 4

can you have 2 same elemnets in a set

Answer 5

what do you mean

can you elaborate

Answer 6

if A person rolled 1,1,4,5 and B rolled 1,1,5,10
does A intersectB represent anything??

Answer 7

oh and what if you wanna put it on venn diagram

Answer 8

do you only put a 1 in intersection or 2

Answer 9

A intersect B would just be the set {1} and that would tell us that A and B both rolled 1 at some point

Answer 10

oh okay veen diagram?

Answer 11

oh wait

A = {1,1,4,5}
B = {1,1,5,10}
A intersect B = {1,5}

Answer 12

would look like this

Answer 13

but you're removing duplicates, so it becomes this

Answer 14

we do not list an element in a set more than once.

Answer 15

A={1,1,4,5} , represent what A person rolled on a dice
Pr(1)=1/2?? or 1/3

Answer 16

or cant be {1,1,4,5}

Answer 17

There are two '1' rolls out of 4, so P(1) = 2/4 = 1/2 for person A

the same can be said for person B

this is probably why it's a bad idea to use sets in this case

Answer 18

ah okay but so can you list element twices?

Answer 19

no each element is listed once in a set

Answer 20

no{1,1,4,6} yes{1,4,6}?

Answer 21

exactly

Answer 22

but then how you do probability if the numbers represent a dice roll