In an experiment similar to Perrin's, you counted the concentration of suspended particles in a liquid. When observing the suspension at a depth 9 mm from the bottom of the container, you counted 300 particles per mm°. At a depth of 18 mm from the bottom, you counted 150 particles in the same volume. With a third observation at a depth of 20 mm from the bottom, the expected number of particles per mm is closest to which value? O 64 particles per mm O 100 particles per mm3 O 75 particles per mm3 O particles per mm3 O 130 particles per mm

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