Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. OAZ,SDF,UGL?AVIJBTFGCTGHDWJRAnswer: D. WJR Read Explanation: The letter-cluster that replaces the question mark (?) is WJR.We analyze the positional movement of each letter position in the alphabet (A = 1, B = 2, ..., Z = 26):1st Letter Pattern (O → S → U → ?):O (15) +4→+ 4 \rightarrow+4→ S (19)S (19) +2→+ 2 \rightarrow+2→ U (21)U (21) +2→+ 2 \rightarrow+2→ W (23) (Pattern increases by +4+4+4, then alternates +2+2+2)2nd Letter Pattern (A → D → G → ?):A (1) +3→+ 3 \rightarrow+3→ D (4)D (4) +3→+ 3 \rightarrow+3→ G (7)G (7) +3→+ 3 \rightarrow+3→ J (10)3rd Letter Pattern (Z → F → L → ?):Z (26) +6→+ 6 \rightarrow+6→ F (6) (26 + 6 = 32 →\rightarrow→ 32 - 26 = 6)F (6) +6→+ 6 \rightarrow+6→ L (12)L (12) +6→+ 6 \rightarrow+6→ R (18) Read more in App