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In a ∆ABC,
angle C =3
angle B = 2(angle A + angle B)
A + B + C = 180°
A +【2(A+B)】+ 3 = 180°
A + 2A + 2B + 3 = 180°
3A + 2B + 3 = 180°
3A + 2B = 180 - 3 = 177
So, 3A +2B = 177
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