whats that apostrophe thing for? help

and here too: A' U B'???

thanks

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- Aug 12th 2008, 05:49 PMNeedHelp18What does this (') mean in problem: (A U B)'??
whats that apostrophe thing for? help

and here too: A' U B'???

thanks - Aug 12th 2008, 06:08 PMskeeter
(A U B)' is the complement of the set A U B ... the set of all elements

**not**in

A U B.

A' U B' is the union of set A's complement and set B's complement.

more info ...

Complement Of A Set (with worked solutions) - Aug 12th 2008, 06:17 PMsaranya
hi

it is very simple

i will try to explain u by an example

if Z = the set of numbers from 1,2,3.....10

then A = the set of numbers, that is 2,6,10

and B = the set of numbers, that is 1,3,5,9

A' means the set of numbers which is not in A

then A' = 1,3,4,5,7,8,9

like that B' = 2,4,6,7,8,10

then A' U B' is the set of all numbers in A' and B'

that is A' U B' = the set of numbers that is 1,2,3,4,5,6,7,8,9,10.

now u may understood that apostrophe denotes "not in the set"

ok - Aug 13th 2008, 02:43 AMSimplicity