For any three sets A(1), A(2), A(3) let ...

For any three sets `A_(1), A_(2), A_(3)` let `B_(1)= A_(1) , B_(2) =A_(2) -A_(1) and B_(3) =A_(3) -(A_(1) uuA_(2)):` then which one of the following statement is always true ?

`A_(1)uuA_(2) uuA_(3) sub B_(1) uuB_(2) B_(3)`

`A_(1)uuA_(2)uuA_(3) =B_(1) uuB_(2) uuB_(3)`

`A_(1) uu A_(2) uuA_(3) sub B_(1) B_(2) uuB_(3)`

none of these

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