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## Homework Statement

Prove De Morgan's Laws (only (A U B)' = A' n B' part)

## Homework Equations

(A U B)' = A' n B'

## The Attempt at a Solution

I used this

x does not belong to (A U B)

x belongs to A' and B'

x belongs to A' n B'

now opposite

x belongs to A' n B'

x belogns to A' and B'

x does not belong to A and B

and that's it.

how can this x does not belong to A and B can be changed into

x does not belong to (A U B)' ?

all these proving things are confusing..they are too obvious and that's why i can not do this properly how silly..

Any tips that can be used when solving this kind of questions?

Thankyou!