The inverse ratio of 3: 2: 1 is?  Select:  A) 1:2:3  B) 2:3:1  C) 3:1:2  D) 2:3:6  E) None of these
Explanation:   1/3: 1/2: 1/1 = 2:3:6   Answer is 2:3:6
<result>D</result>
The inverse ratio of 3: 2: 1 is?