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S and T are the foci of an ellipse and B...

S and T are the foci of an ellipse and B is the end point of the minor axis. If STB is equilateral triangle, the eccentricity of the ellipse is

A

`(1)/(4)`

B

`(1)/(3)`

C

`(1)/(2)`

D

`(2)/(3)`

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