Multiple choice The octal addition of (25)8 and (15)8 is: (42)8 (40)8 (41)8 None of these Reveal answer Fill a bubble to check yourself A Correct answer Explanation In octal addition: 5 + 5 = 10 (decimal), which is 12 in octal (write 2, carry 1). Then 2 + 1 + 1 (carry) = 4. Result is 42.