The term that will replace the question mark to complete the series is H36S.
The series consists of three distinct components following their own specific mathematical progressions
1. First Letter (Increasing by consecutive multiples of 3):
* D (4) +3= G (7)
* G (7) +6= M (13)
* M (13) +9= V (22)
* V (22) +12=34→ Subtracting 26 gives 8, which is H
2. Middle Number (Adding the square of consecutive natural numbers):
* 6+12(1)= 7
* 7+22(4)= 11
* 11+32(9)= 20
* 20+42(16)= 36
3. Last Letter (Decreasing by consecutive multiples of 3):
* W (23) −3= T (20)
* T (20) −6= N (14)
* N (14) −9= E (5)
* E (5) −12=−7→ Adding 26 gives 19, which is S
Combining these three results gives us the final term: H36S.