Q.2506 : किसी Δ ABC में यदि ∠A - ∠B = 40° तथा ∠B

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Q.2506 : किसी Δ ABC में यदि ∠A - ∠B = 40° तथा ∠B - ∠C = 10° हो तो ∠B = ?
(a) 70°
(b) 60°
(c) 80°
(d) 50°

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Answer :50°