Mixed Medium · Set 61

8 problems
1
Input: 4 → [?] → 9, what is the rule? =
2
? → [-1] → 8 =
3
? → [×2 + 1] → 7 =
4
? → [×3] → 12 =
5
Input: 4 → [?] → 20, what is the rule? =
6
Input: 1 → [?] → 11, what is the rule? =
7
Input: 2 → [×3] → ? =
8
Input: 4 → [+5] → ? =
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