ABCD is a cyclic trapezium with $AB\parallel DC$ and AB = diameter of the circle. If $\angle CAB$ = $30^{0}$ , then $\angle ADC$ is

ABCD is a cyclic trapezium with $AB\parallel DC$ and AB = diameter of the circle. If $\angle CAB$ = $30^{0}$ , then $\angle ADC$ is
1). $60^{0}$
2). $120^{0}$
3). $150^{0}$
4). $30^{0}$

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