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Prove that A – B = A ∩ B.’

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Let x be some element in set A – B that is x ∈ (A – B) 

Now if we prove that x ∈ (A ∩ B’) then (A – B) = (A ∩ B’) 

x ∈ (A – B) means x ∈ A and x ∉ B 

Now x ∉ B means x ∈ B.’ 

Hence we can say that x ∈ A and x ∈ B'.

Hence x ∈ A ∩ B.’ 

And as x ∈ A ∩ B’ and also x ∈ A – B we can conclude that A – B = A ∩ B.’

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