Hard · Set 64

8 problems
1
Input: 4 → [?] → 12, what is the rule? =
2
? → [×5] → 25 =
3
Input: 8 → [×2 + 1] → ? =
4
? → [-1] → 0 =
5
Input: 5 → [-1] → ? =
6
Input: 3 → [×2 + 1] → ? =
7
Input: 5 → [×3] → ? =
8
Input: 4 → [?] → 1, what is the rule? =
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