Which letter-cluster will replace the question mark (?) and complete the given series?
UTSR, XWVU, ?, DCBA, GFED
- ABZYW
- BBZYX
- CAZWY
- DAZYX
Solution & Step-by-step Explanation
Let's look at the first letter of each cluster in the series:
U
+3
X
+3
A
+3
D
+3
G
Now, let's inspect the internal structure of each cluster:
UTSR is formed by counting backwards from U: U→T→S→R
XWVU is formed by counting backwards from X: X→W→V→U
Following the same logic, counting backwards from A gives: A→Z→Y→X (AZYX)
DCBA is formed by counting backwards from D.
GFED is formed by counting backwards from G.
Thus, the missing letter-cluster is AZYX.
U
+3
X
+3
A
+3
D
+3
G
Now, let's inspect the internal structure of each cluster:
UTSR is formed by counting backwards from U: U→T→S→R
XWVU is formed by counting backwards from X: X→W→V→U
Following the same logic, counting backwards from A gives: A→Z→Y→X (AZYX)
DCBA is formed by counting backwards from D.
GFED is formed by counting backwards from G.
Thus, the missing letter-cluster is AZYX.