Question
Write the integer, whose product with $(-1)$ is 1.
✓
Answer
If $(-1)$ is multiplied by $(-1)$, then it gives 1 always
i.e. $(-1) \times(-1)=1$ $
[\because(-a) \times(-b)=(a \times b)]
$
i.e. $(-1) \times(-1)=1$ $
[\because(-a) \times(-b)=(a \times b)]
$
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