2
Input: 5 → [?] → 7, what is the rule? =
3
Input: 9 → [?] → 8, what is the rule? =
4
Input: 8 → [?] → 40, what is the rule? =
5
Input: 10 → [?] → 30, what is the rule? =
6
Input: 3 → [?] → 13, what is the rule? =
7
Input: 3 → [?] → 5, what is the rule? =
8
Input: 8 → [?] → 16, what is the rule? =