Medium · Set 38

8 problems
1
Input: 5 → [×3] → ? =
2
? → [+4 ×2] → 12 =
3
Input: 10 → [?] → 20, what is the rule? =
4
Input: 4 → [-1] → ? =
5
Input: 2 → [+2] → ? =
6
Input: 4 → [?] → 20, what is the rule? =
7
? → [×3 - 2] → 10 =
8
Input: 4 → [?] → 11, what is the rule? =
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