Question

Given X = {15, 22, 33, 44, 89, 165, 1025} and Y = {-5, 15, 33, 88, 99, 150, 160, 1025}, which of the following statements is false?
X ∪ Y = {-5, 15, 22, 33, 44, 89, 99, 150, 160, 165, 1025}
X ∩ Y = {15, 33, 1025}

Answer 1

X ∪ Y means union of X and Y
are there any elements left out?

Answer 2

ooh,i didnt even see that the 88 wasn't there, thanks

Answer 3

Union is every thing they both have so if A = { a,b,c } and B = {a,b,d}
then are the elements in A or B thus AUB = {a,b,c,d}
intersection is only the elements they both have. so only elements in A and B so
A intercect B = {a,b}

Answer 4

hey can you help with this one too?
Which of the following describes the graph of {x | 2 < x < 2}?

just a closed circle on 2
an open circle on 2 and arrows pointing out
the entire number line
no solution

Answer 5

can something be less than two and greater than two?

Answer 6

yw

Answer 7

if it's a union then yeah, so is it no solution?

Answer 8

That says nothing about union, and no number can be greater than and smaller than a number

Answer 9

i know that , but i've seen graphs with an open circle on a number, and lines pointing out in both directions, i guess i just got a lil confused

Answer 10

does it mean every value of x < 2 and > 2
in which caes in second option

Answer 11

* in which case its second option

Answer 12

that's what i thought, but i got that one wrong, thats why i asked, :b