A human aorta has a lumen width of 2 cm.
A human red blood cell has a diameter of $7\,\mu m$.
How many red blood cells could be laid end to end across the diameter of the aorta lumen?
1 )
$2.9 \times {10^{ - 3}}$
2 )
$2.9 \times {10^{ - 2}}$
3 )
$2.9 \times {10^{ 2}}$
$2.9 \times {10^{ 3}}$
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