Letter clusters: every letter moves -1

The same question, asked 3 times: 18 Sep 2024 S1*, 14 Sep 2025 S3*, 18 Sep 2025 S2. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
18 Sep 2024 S1
6 $Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete? WIX, VHW, UGV, TFU, ?$
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Question 2
14 Sep 2025 S3
2 $Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. PRT, OQS, NPR, ?$
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Question 3
18 Sep 2025 S2
16 $What comes next? ZYX, YXW, XWV, WVU, ?$
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Question 1