Concept:The series follows a fixed letter-position increment in each place.Explanation:Write the letter positions: D=4, F=6, E=5.Next term: H=8, J=10, I=9.Next term: L=12, N=14, M=13.Next term: P=16, R=18, Q=17.In each term, the first, second, and third letters each increase by 4 from the previous term.So the next term is:First letter: 16+4=20⇒TSecond letter: 18+4=22⇒VThird letter: 17+4=21⇒UThus, the missing term is TVU.