function-machine/subtraction/hard · Set 50

8 problems
1
? → [×2 + 3] → 21 =
2
Input: 5 → [?] → 13, what is the rule? =
3
Input: 10 → [?] → 30, what is the rule? =
4
Input: 1 → [+2] → ? =
5
? → [-1] → 7 =
6
Input: 7 → [?] → 22, what is the rule? =
7
? → [×3] → 24 =
8
Input: 4 → [?] → 9, what is the rule? =
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