Letter-number terms: letter and number each move by fixed steps; find the term that breaks it

This type of question, asked 2 times: 23 Sep 2025 S1, 24 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
23 Sep 2025 S1
10 $Find the pair that does NOT follow the double-step pattern. Q2, R4, S6, T8, V12$
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Question 2
24 Sep 2025 S2
13 $Choose the item that breaks the rule. A5, C7, E9, G11, I10$
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