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Group index is defined by which of the equation?

(a) GI=0.2b+0.005ac+0.01bd

(b) GI=0.2a+0.005bd+0.001ac

(c) GI=0.2a+0.005ac+0.001bd

(d) GI=0.2a+0.5ac+0.001bd

The question was posed to me in quiz.

Question is from Soils in portion Classification of Soils of Geotechnical Engineering I

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Right answer is (c) GI=0.2a+0.005ac+0.001bd

Explanation: Group index (GI) is given by the following equation

GI = 0.2a+0.005ac+0.01bd.

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