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If a /\ ABC, if r=r2+r3-r1 and /Agt pi/3...

If a `/_\ ABC, if r=r_2+r_3-r_1 and /_Agt pi/3` then the range of `S/a` is equal to (A) `(1/2, 2)` (B) (1/2,∞)` (C) `(1/2,3)` (D) `(3,∞)`

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