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In triangle A B C ,a : b : c=4:5: 6. The...

In triangle `A B C ,a : b : c=4:5: 6.` The ratio of the radius of the circumcircle to that of the incircle is____.

A

`16//7`

B

`7//16`

C

`15//7`

D

`7//15`

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