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