function-machine/subtraction/expert · Set 74

8 problems
1
Input: 1 → [?] → 6, what is the rule? =
2
? → [×3 - 2] → 1 =
3
Input: 6 → [×5] → ? =
4
Input: 9 → [+2] → ? =
5
Input: 10 → [?] → 28, what is the rule? =
6
? → [×2 + 1] → 21 =
7
? → [+4 ×2] → 22 =
8
Input: 4 → [?] → 9, what is the rule? =
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