What is the equation used for calculating G value in terms of HSI comp

1.	What is the equation used for calculating G value in terms of HSI components?
A.	G=3I-(R+B)
B.	G=3I+(R+B)
C.	G=3I-(R-B)
D.	G=2I-(R+B)
Answer» B. G=3I+(R+B)

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