EM-1243

Set notation

E Math · Secondary 3 · Hard · Set notation

Let

B = \{x \in \mathbb{Z} : x^2 = -1\}

, where

\mathbb{Z}

is the set of all integers. Which statement about

B

is correct?

$B = \emptyset$
$0 \in B$
$B = \{-1,1\}$
$B$ is the universal set

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