10³ kilometre is equal to
1) 10⁵mm
2) 10⁶mm
3) 10⁹ mm
4) 10¹²mm
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Step-by-step explanation:
l1 kilometer=1000*100*10 mm
1 kilometer=10^6 mm
10^3 kilometer=10^6*10^3 mm
10^3 kilometer=10^9 mm
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