3 is CORRECT. (187)10 = (273)8, by dividing 187 by 8 three times and recording the remainders: 187/8 = 23 with r = 3; 23/8 = 2 with r = 7; 2/8 = 0 with r = 2. Stop here because 0 was reached. Read the r numbers backwards to get 273.
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