Medium · Set 44

8 problems
1
Input: 2 → [?] → 6, what is the rule? =
2
Input: 2 → [?] → 7, what is the rule? =
3
? → [×2 + 3] → 9 =
4
Input: 9 → [?] → 27, what is the rule? =
5
Input: 9 → [×2 + 1] → ? =
6
Input: 6 → [×2] → ? =
7
? → [+2] → 5 =
8
Input: 4 → [+2] → ? =
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