The inverse ratio of 6: 2: 1 is?  Choose the most appropriate option:  A) 2:3:7  B) 2:3:9  C) 2:3:2  D) 1:3:6  E) 2:3:1
1/6: 1/2: 1/1 = 1:3:6   Answer:1:3:6
<result>D</result>
The inverse ratio of 6: 2: 1 is?