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P is any point on the ellipse x^2/144+y^...

P is any point on the ellipse `x^2/144+y^2/36=1` and S ans S' are foci, then the perimeter of `triangle SPS'` is :

A

`6(sqrt3+2)`

B

`12sqrt3`

C

`12(sqrt3+2)`

D

`18sqrt3`

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