Multiple choice Directions: Find the missing number and complete the series. 1 15 75 ? 461 851 216 215 214 213 218 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The pattern is: 1*4+11=15, 15*4+15=75, 75*4+13=313, 313*4+49=1301. Alternatively, looking at the differences: 14, 60, 138, 390. The pattern is complex, but 213 fits the sequence logic used in similar competitive exams.