Number series: each term made from the previous two terms (sum or product)

This type of question, asked 3 times: 17 Sep 2025 S1, 19 Sep 2025 S3, 24 Sep 2025 S3. All 3 questions below, oldest first.

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Question 1
17 Sep 2025 S1
7 $What comes next: 3, 6, 18, 108, ?$
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Question 2
19 Sep 2025 S3
24 $What should come at the place of question mark? : 3, 6, 18, 108, ?$
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Question 3
24 Sep 2025 S3
18 $Find the next number. 1, 1, 2, 3, 5, ?$
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