Given V prop r^3 and V = 18Pi when r = 3...

Given `V prop r^3` and V = 18Pi` when r = 3. Then relation between V and r is____

A

` V = 4/3Pir^3`

B

` V = 1/3Pir^3`

C

` V = 2/3Pir^3`

D

` V = Pir^3`

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