Single-letter series with gaps growing by 1 (+2, +3, +4 ...)

This type of question, asked 6 times: 21 Sep 2025 S3, 22 Sep 2025 S1, 22 Sep 2025 S3, 24 Sep 2025 S3, 26 Sep 2025 S1, 26 Sep 2025 S3. All 6 questions below, oldest first.

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Question 1
21 Sep 2025 S3
1 $5^{th}$
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Question 2
22 Sep 2025 S1
9 $What comes next? Z, X, U, Q, ?$
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Question 3
22 Sep 2025 S3
9 $What comes next? A, C, F, J, O, ?$
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Question 4
24 Sep 2025 S3
15 $What comes next in the series? Z, W, S, N, ?$
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Question 5
26 Sep 2025 S1
16 $What comes next in the series? A, C, F, J, ?$
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Question 6
26 Sep 2025 S3
17 $What comes next in the series? M, N, P, S, W, ?$
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Single-letter series with gaps growing by 1 (+2, +3, +4 ...)

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6