This snip off is from Himedia Widal test teaching kit.
I understand 1/20 1/40 1/80... are the concentrations in each test tube. They are obtained by the following calculation: (2nd testube) 1/2 X 1/20.
But I can't decipher the numbers written at the top, 10-1 , 10-2 etc.
Besides which of of these two set of numbers should be called dilution factor.
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