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$\text{Convert } 300000 \ \text{m}^2 \text{ into km}^2$
$3\cdot 10^{9} \ \text{km}^2$
$3 \ \text{km}^2$
$3\cdot 10^{11} \ \text{km}^2$
$0.3 \ \text{km}^2$
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