Identify the letter that does NOT belong to the following series.
X, U, Q, M, F, Y

Correct option is D

Given: X, U, Q, M, F, Y
Based on the pattern of decreasing letter positions:
X (24th letter) U (21st letter) → difference of 3
U (21st letter) → Q (17th letter) difference of 4
Q (17th letter) → M (13th letter) should have been L (12th letter) difference of 5
L (12th letter) → F (6th letter) difference of 6 (follows correctly)
F (6th letter) → Y (25th letter) difference of 7
Thus, the correct answer is indeed M, as it breaks the expected pattern.
Correct answer is (d) M