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Six numbers a , b , c , d , e ,f are ...

Six numbers `a , b , c , d , e ,f` are such that `a b=1,\ b c=1/2, c d=5,\ d e=2\ a n d\ ef=1/2dot` What is the value of `(a d : b e : cf)?` `4:3: 27` b. `6:1:9` c. `8:9:9` d. `72 :1:9`

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