In triangleABC, If (b+c)/(11)=(c+a)/(12)...

In `triangleABC`, If `(b+c)/(11)=(c+a)/(12)=(a+b)/(13)`, then `cosC=`

A

`7//5`

B

`5//7`

C

`17//16`

D

`16//17`

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The correct Answer is:

B

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