Concept:The series is based on the alphabetical positions, where the difference between consecutive letters increases by 1 each time.Explanation:Assign numbers to letters: B=2, F=6, K=11, Q=17.Find differences: 6-2=4, 11-6=5, 17-11=6.The difference increases by 1 each step. So the next difference is 7.Add 7 to the last position: 17+7=24.The 24th letter is X.
