Concept:The relationship involves a fixed pattern: first letter increases by 1, second letter increases by 2, and the number is multiplied by 2.Explanation:For QF20 to RH40: Q (17) + 1 = R (18); F (6) + 2 = H (8); 20 × 2 = 40.For LX15 to MZ30: L (12) + 1 = M (13); X (24) + 2 = Z (26); 15 × 2 = 30.Now apply same logic to GP12: G (7) + 1 = H (8); P (16) + 2 = R (18); 12 × 2 = 24.Thus, the missing cluster is HR24.
