A) \[20{}^\circ ,40{}^\circ ,120{}^\circ \]
B) \[60{}^\circ ,20{}^\circ ,100{}^\circ \]
C) \[120{}^\circ ,20{}^\circ ,40{}^\circ \]
D) \[10{}^\circ ,40{}^\circ ,130{}^\circ \]
E) None of these
Correct Answer: A
Solution :
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