Multiple choice Find the missing term (?) in the following series: 52, 87, 120, 151, 180, ? 207 226 206 228 227 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Differences: 87-52=35, 120-87=33, 151-120=31, 180-151=29. The differences are decreasing by 2. Next difference should be 27. 180 + 27 = 207.