∠CAB = 2 ∠ABC ∠ACB + ∠ACD">
The side BC of a triangle ABC is extended to D. If ∠ACD = 120° and ∠ABC = \frac{1}{2} ∠CAB, then the value of ∠ABC is:
[A] 20°
[B] 80°
[C] 40°
[D] 60°
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