Group index is defined by which of the equation?$

1.	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
Answer» D. GI=0.2a+0.5ac+0.001bd

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