Starter · Set 75

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