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Given their approximate diameters, find out the approximate number of

a. hepatocytes (diameter 20 micrometers) radius=10 micrometers,
b. bacteria (diameter 1 micrometers) radius=0.5 micrometers, and

c. virus particles (diameter 10 nm, radius=5 nm=.005 micrometers)

that can be placed in a single layer, on the head of a pin (diameter 0.5 mm= 500 micrometers, radius=250 micrometers). Assume all of the cells, particles and the pinhead to be spherical.

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