1.

Let A_(1), A_(2) and A_(3) be subsets of a set X. Which one of the following is correct ?

Answer»

`A_(1)uuA_(2)uuA_(3)` is the SMALLEST SUBSET of `X` containing elements of each of `A_(1)`, `A_(2)` and `A_(3)`
`A_(1)uuA_(2)uuA_(3)` is the smallest subset of `X` containing elements EITHER `A_(1)` or `A_(2)uuA_(3)` but not both
The smallest subset of `X` containing `A_(1)uuA_(2)` and `A_(3)` equals the smallest subset of `X` containing both `A_(1)` and `A_(2)uuA_(3)` only if `A_(2)=A_(3)`
None of these

Answer :A


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