A) \[{{101}^{o}}\]
B) \[{{149}^{o}}\]
C) \[{{71}^{o}}\]
D) \[{{140}^{o}}\]
Correct Answer: B
Solution :
Since, COD is a straight line. \[\therefore \] \[\angle BOC+\angle BOD={{180}^{o}}\](linear pair) \[\Rightarrow \] \[\angle BOC+{{31}^{o}}={{180}^{o}}\] \[\Rightarrow \] \[\angle BOC={{180}^{o}}-{{31}^{o}}={{149}^{o}}.\]
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