Multiple choice general knowledge math & puzzles 1 7 2 6 3 5 4........... 5 4 2 3 Reveal answer Fill a bubble to check yourself B Correct answer Explanation This is an alternating series. The first series (1st, 3rd, 5th, 7th terms) increases by 1: 1, 2, 3, 4. The second series (2nd, 4th, 6th terms) decreases by 1: 7, 6, 5. The next term in the second series would be 4.