If there are 40 grains in 1 mm2 at 100X, how many grains were there in – McqOptions

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1.	If there are 40 grains in 1 mm² at 100X, how many grains were there in the actual grain of 1 mm² of the surface?
A.	200
B.	200000
C.	0.4
D.	400000
Answer» E.

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