1
Input: 8 → [?] → 7, what is the rule? =
3
Input: 1 → [?] → 6, what is the rule? =
4
Input: 10 → [?] → 20, what is the rule? =
5
Input: 8 → [?] → 16, what is the rule? =
6
Input: 6 → [?] → 5, what is the rule? =
8
Input: 8 → [?] → 13, what is the rule? =