Question

The sets C and D are defined as follows.

C={xlx<4}
D={xlx≥9}

Write C∩D and C∪D using interval notation.

Answer 1

C = { ..., 1,2,3}

D = { 9,10,11,....}

can u write
\[C \cup D=\]

Answer 2

\[C \cup D\]

Answer 3

C U D mean set which contains all the elements of C or all the elements of D

Answer 4

Ok so where would that be?

Answer 5

How do I put the answers for these sets together?

Answer 6

Would the answer for Union be (infinity, 4]?

Answer 7

yes, can show ur answer

Answer 8

\[C \cup D = \left\{ x/x<4,x \ge9 \right\}\]

Answer 9

I dont understand. I need help putting the answer together. I dont understand how to get the answer though.

Answer 10

C inter section D = common elements of both sets

Answer 11

So how do I get the answer?

Answer 12

i will give one simple example
A={ 1,2,3,4}
B= { 3,5,7}

AU B = { 1,2,3,4,3,5,7} [ written all the elements in A and B]

= { 1,2,3,4,5,7} [ repeated elements are written only once]

Answer 13

is it clear

Answer 14

So its just numbers? No infinite?

Answer 15

What about for C and D?

Answer 16

for infinite elements we can use set builder form
which we written above[answer for ur question]

Answer 17

Ok so {1,2,3,4,5,6,7} is the answer for CUD?

Answer 18

for C upside down U D is no solution?

Answer 19

Ok and the other set?

Answer 20

Hello?