Answer :

In

A + B + C = 180o


60o + B + C = 180o


B + C = 120o


B + C = 60o (i)



BOC + OBC + OCB = 180o


BOC + B + C = 180o


BOC + (B + C) = 180o


BOC + 60o = 180o [From (i)]


BOC = 120o

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