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358 easy men

how did you get that answer?

comon sense?

yes but there must be a mathematical technique you used to get the answer

no just common sense

trust me men simple

why i think i chose them answers?

use comon sense look at hte numbers

and thats ur answer

u must fail at math if u have no common sense

i have no answer choice as 3,5,8 and thank you for being civilized and kindhearted -_-

Oh yeah, now you hav TWO ignorant people

A = {2,3,5,7,8} and B = {3,5,8,9}|dw:1364782794558:dw|

find what's in the center. That is what the Union symbol means.

3,5,and 8

yes but i have no answer choice like that whatsoever

that's cause that's the intersection.

My bad. The union is the concatenation of the two

yes wouldnt that be the middle?

A = {2,3,5,7,8} and B = {3,5,8,9}
join the two sets together and take out repeats

3 and 5
then that would explain it...

and 8

No.
{2,3,5,7,8}U{3,5,8}
is {2,3,5,7,8}

http://en.wikipedia.org/wiki/Union_%28set_theory%29

I'm sorry what I said before is the intersection.

i have no answer choice like that
i have
{5}
{5,8}
{2,3,4,7,9}
{2,3,4,5,7,8,9}

http://en.wikipedia.org/wiki/Union_%28set_theory%29

yes i know ive read it but my answer choices make that article invalid...

yeah, well can't help you there. The answer should be what agrees with that wiki article.

you can never trust Wiki...

yeah aint nobody got time for that so thank you for your help!

np :)