Find the set A — task. Assessments, Math TN.

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The Cartesian product

$A \times A$ has

$9$ elements among which

$(- 1, 0)$ and

$(0, 1)$ are found. Then, the set

$A =$

$\{-1,0\}$
$\{0,1\}$
$\{-1,0,1\}$
$\{3\}$

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