Find the missing letter/number
The sequence follows this pattern:
- The first element increments by 1 (B, D, H, F...).
- The numerical element increments by 1 (2, 3, 5...).
- The final element is a 3-letter sequence progressing alphabetically (CD, E3F, etc.).
Therefore, the subsequent term is: G3HI.
\(\Rightarrow\) \(\boxed{\text{G3HI}}\)