Question

What does a Union do?

Answer 1

Union of a Set?

Answer 2

yes

Answer 3

Union of a set does combine all the elements in the two sets without repeating any of the element of the set..

Answer 4

Union is a set of all elements put together.

The union of two sets A and B is the collection of all elements in A and B.

For Example:

A: {a,b,c,d}
B: {e,f,g,h}

A U B = {a,b,c,d,e,f,g,h}

Answer 5

oh okay and what does the n thingy do?

Answer 6

doesnt it find all the same and put it in a seperate group?

Answer 7

Suppose you have tow sets;

A = {1, 2, 3}

B = {2 , 4}

A Union B = {1, 2, 3, 4}

Answer 8

You mean " n(A U B) " this is number of elements in A U B

Answer 9

no i mean the upside down U

Answer 10

That is called Intersection..

Answer 11

Thats is intersection

elements which are common in both sets


For example:
A ; {1,2,3}
B : { 2,4,6}

A ∩ B = {2}

Answer 12

That will give you the intersection of the two sets..

Answer 13

Suppsoe you have:

A = {1 , 3, 4}

B = {1, 3}

So the common elements will give you intersection:

\(A \cap B\) = {1, 3}

Answer 14

oh okay. and is x or y of a function the range?

Answer 15

Range is all y values

Answer 16

okay! and i have one more question

Answer 17

If T = {positive integers} and subset W = {5, 10, 15, 20, …}, what is W'?

Answer 18

W is subset..

Answer 19

W is subset of T which is having positive integers divisible by 5..

Answer 20

and W' is complement of W ,that means all those elements which are not in W

since W is a subset of T ,W' is the set of all elements which are present in T but not in W

Answer 21

so what can that be?

Answer 22

There are multiples of 5 present in W..

So if you delete multiples of 5 from T you will get W' right??