Question

what is the correct way to express this problem using the roster method? {x|x is a city in the country where you live} ?

Answer 1

{x|x is a city in the country where you live} = {list of all cities}

this may be a big set, so here's a smaller example

{x| x is a day of the week} = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday}

Answer 2

the idea is just to list all elements of the set

Answer 3

Thanks alot!!!

Answer 4

np