function-machine/subtraction/hard · Sada 67

8 problems
1
Input: 10 → [?] → 20, what is the rule? =
2
? → [×2 + 1] → 13 =
3
Input: 9 → [?] → 18, what is the rule? =
4
Input: 9 → [×3] → ? =
5
? → [×5] → 45 =
6
Input: 8 → [×3] → ? =
7
? → [×2 + 3] → 17 =
8
Input: 3 → [?] → 15, what is the rule? =
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