Differences grow by 3 each time (+3, +6, +9 or +14, +17, +20): find the term

The same question, asked 8 times: 14 Jul 2023 S2*, 18 Jul 2023 S4*, 19 Jul 2023 S1*, 9 Sep 2024 S2*, 17 Sep 2024 S2*, 12 Sep 2025 S2*, 15 Sep 2025 S3*, 22 Sep 2025 S3. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
14 Jul 2023 S2
4 $Which number should replace the question mark (?) in the following number series? 39, 42, 48, 57, 69, ?, 102$
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Question 2
18 Jul 2023 S4
2 $Which of the following numbers will replace the question mark (?) in the given series? 11, ?, 20, 29, 41, 56$
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Question 3
19 Jul 2023 S1
22 $Which of the following numbers will replace the question mark (?) in the given series? 3, 12, ?, 39, 57, 78$
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Question 4
9 Sep 2024 S2
14 $Select the number from among the given options that can replace the question mark (?) in the following series. 99, 123, 150, 180, 213, ?$
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Question 5
17 Sep 2024 S2
24 $Select the number from among the given options that can replace the question mark (?) in the following series. 949, 1006, 1066, 1129, 1195, ?$
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Question 6
12 Sep 2025 S2
5 $Complete the series: ___________, 150, 183, 219, 258$
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Question 7
15 Sep 2025 S3
8 $Complete the series: 28, 42,59,79,102, ?$
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Question 8
22 Sep 2025 S3
19 $What should come at the place of question mark? 3, 7, 14, 24, 37, ?$
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Differences grow by 3 each time (+3, +6, +9 or +14, +17, +20): find the term

Question 1

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Question 8