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In triangle ABC, if r(1) = 2r(2) = 3r(3)...

In triangle ABC, if `r_(1) = 2r_(2) = 3r_(3)`, then `a : b` is equal to

A

`a/b=5/4`

B

`a/b=3/5`

C

`a/c=7/4`

D

`c/a=4/9`

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