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With the usual notation, in Δ ABC, if ∠ A + ∠ B = 120º, a = 3 + 1 and b = 3 – 1, then the ratio B : A ∠ ∠ , is -

1. 9 : 7
2. 7 : 1
3. 5 : 3
4. 3 : 1

Correct answer: 7 : 1

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