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1. Angle NCB in a triangle ●●●○○ 50 ptsIn $\triangle ABC$, $\angle ABC=50^{\circ}$ and $\angle ACB=20^{\circ}$. Point $N$ is inside $\triangle ABC$ with $\angle NAB=40^{\circ}$ and $\angle NBC=30^{\circ}$. Find the measure of $\angle NCB$ in degrees.