Question

Helpppppp pleasse!

If S = {positive integers} and subset T = {positive integers divisible by 3}, what is T'?

{3, 6, 9, 12, ...}
{1, 2, 3, 4, 5, ...}
{1, 2, 4, 5, 7, 8, ...}
{ }

I have no idea but i know its not A :/

Answer 1

since T={3,6,9,................}
and T'=U-T
where U is universal set
so T' is all numbers except number is in T.

Answer 2

I dont understand :(

Answer 3

ans---{1,2,4,5,7,8,10,11,13,.............}

Answer 4

since T has elements 3,6,9,...... which is divisible by 3
and T' that is complement of T has all elements except divisible by 3.

Answer 5

Ahh i get it now!! are you completely sure? :)

Answer 6

yes always in set theory.

Answer 7

remember its T' that is T complements.that ( ' ) is important.

Answer 8

Thank you so much! :)) you where right!