C5, F4, E7, H6, _______

Explanation:

Let’s break down the pattern:

• First character pattern (letters):
  • C, F, E, H, ?
  • C (3rd letter), F (6th), E (5th), H (8th)
  • Pattern: +3, -1, +3, so the next should be -1: H (8th) - 1 → G (7th letter)
• Second character pattern (numbers):
  • 5, 4, 7, 6, ?
  • 5 → 4 (–1), 4 → 7 (+3), 7 → 6 (–1), so next is +3: 6 + 3 = 9

Thus, combining both, the answer is G9.