Multiple choice Complete the series: (101)2, (111)2, (1001)2¸ (1011)2¸ (1101)2 (10111)2 (12)2 (1001)2 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The series is binary: 5, 7, 9, 11. The next odd number is 13, which is 1101 in binary.