In a DeltaABC, if r=r2+r3-r1 and Agt pi/...

In a `DeltaABC`, if `r=r_2+r_3-r_1` and `Agt pi/3` then range of `s/a` contains
(A) `(1/2, 2)`
(B) `[1,2)`
(C) `(1/2, 3)`
(D) `(3,oo)`

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