function-machine/subtraction/medium · 세트 68

8 problems
1
Input: 4 → [×3] → ? =
2
Input: 10 → [?] → 21, what is the rule? =
3
? → [+4 ×2] → 20 =
4
? → [+5] → 13 =
5
Input: 3 → [?] → 8, what is the rule? =
6
Input: 8 → [×2] → ? =
7
Input: 4 → [?] → 12, what is the rule? =
8
? → [+4 ×2] → 18 =
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