Sets + Union ??

BluebellDementia

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Joined
Oct 4, 2010
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3
Good evening/morning/night (or whatever time of the day it is for you)

(I hope this is in the right section, I apologize if it isn't)
I would like to jump straight to the point, I am a first year college student and I have my Math preliminary exam in about... Four or so hours and there's been something that I don't quite understand how to answer from notes I have, (I was absent that day regarding this question in particular and was stupid enough not to ask the professor about it sooner)

Here is the question, copy pasted:
_____________

3. In each of the following, determine which one of the sets N, J, Q H, R and Ø is equal to the given set.
a) J U Q

b) J (intersection) Q

c) N (intersection) H

d) H U R
______________

Does anyone know how to answer this question? We had previous ones that I knew how to answer (which I will post below) and I understand what this question asks, I just don't know how to answer it. For example, in the first question I know it says: The integer set Union the Rational set = (and then you add one of the above listed sets I guess?) I'm not quite sure what they mean. Any help would be greatly appreciated <3

Here are some of the previous questions (That I knew how to answer):

1. Insert or in the blank to make the statement correct.

a) 15____ N e) 0____ Q
b) 1.41421____H f) 2009____ J
c) -3____ J g) ____ R
d) ____ Q h) -5____ H.

2. Insert or in the blank to make the statement correct.

a) N ____ Q
b) R ____ Q
c) J ____ N
d) J ____ R
e) R ¬____ N
f) J ____ Q
g) H ____ R
h) {0} ____ J
 

lookagain

Senior Member
Joined
Aug 22, 2010
Messages
2,375
BluebellDementia said:
Here is the question, copy pasted:
_____________

3. In each of the following, determine which one of the sets N, J, Q H, R and Ø is equal to the given set.
a) J U Q

b) J (intersection) Q

c) N (intersection) H

d) H U R
______________
What sets (what types) of numbers are meant by the sets N, J, Q, H, and R, respectively?
 

BluebellDementia

New member
Joined
Oct 4, 2010
Messages
3
lookagain said:
BluebellDementia said:
Here is the question, copy pasted:
_____________

3. In each of the following, determine which one of the sets N, J, Q H, R and Ø is equal to the given set.
a) J U Q

b) J (intersection) Q

c) N (intersection) H

d) H U R
______________
What sets (what types) of numbers are meant by the sets N, J, Q, H, and R, respectively?
(Thanks for replying on such short notice)

N = Natural numbers
J = Integers
Q = Rational numbers
H = Irrational numbers
R = Real numbers
 

lookagain

Senior Member
Joined
Aug 22, 2010
Messages
2,375
BluebellDementia said:
lookagain said:
BluebellDementia said:
3. In each of the following, determine which one of the sets N, J, Q H, R and Ø is equal to the given set.
a) J U Q

b) J (intersection) Q

c) N (intersection) H

d) H U R
______________
N = Natural numbers
J = Integers
Q = Rational numbers
H = Irrational numbers
R = Real numbers
a) The set of integers in union with the set of rational numbers gives the set of rational numbers,
because the set of integers is a subset of the set of rational numbers. \(\displaystyle **\) \(\displaystyle \boxed{ Q}\)


b) The intersection of the set of integers with the set of rational numbers is the set of integers,
because the intersection is more restrictive. See \(\displaystyle **\) above. \(\displaystyle \boxed{ J}\)


c) The intersection of the set of natural numbers with the set of irrational numbers is the empty set, or \(\displaystyle \{\ \}\\),
because the set of natural numbers is a subset of the set of rational numbers. But the set of rational numbers
and the set of irrational numbers have no elements in common. \(\displaystyle \boxed{ \{\ \} }\)


d) The union of the set of irrational numbers with the set of real numbers is the set of real numbers,
because the set of irrational numbers is a subset of the set of real numbers. \(\displaystyle \boxed{ R}\)
 

BluebellDementia

New member
Joined
Oct 4, 2010
Messages
3
Thank you so much for your help, sorry I was so late in thanking you!
 
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