## jollysailorbold 2 years ago Select all of the following true statements if R = real numbers, I = integers, and N = {1, 2, ...}. -> ∅⊂R -> 0∈I -> R⊂N -> N⊂I -> {1, 2, ...}⊆N -> -4∈N

1. Kanwar245

empty set is subset of any set integers contain all positive and negative integers including 0 so 0 does belong in them R is much bigger than N, in fact R is uncountable and N is countable, so R can't be a subset of N Integers contain positive integers which are essentially the natural numbers, so N is a subset of I also {1,2,...} is a subset of N since its N itself -4 doesnt belong in N since N doesnt contain any negative numbers

2. nincompoop

3. jollysailorbold

I was confused about what the different signs meant, but I'm more familiar with them now. Thanks for both of your time. :)

4. nincompoop
5. jollysailorbold

so if it asks Find A U B if A = {3, 6, 9, 12} and B = {2, 4, 6, 8, 10}. It would be {6} because U = the set of things that are in at least one member of A. Right?

6. nincompoop
7. jollysailorbold

A U B from A = {3, 6, 9, 12} and B = {2, 4, 6, 8, 10} would be {2, 3, 4, 6, 9, 12} and A n B from A = {3, 6, 9, 12} and B = {2, 4, 6, 8, 10} would be {6} Thanks for you links. :)

8. jollysailorbold

your*

9. nincompoop

∪ = union ∩ = intersection