medium Set 61 Form Exercise

Input: 4 → [?] → 9, what is the rule?

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Answer: ×2 + 1

SubType
find-rule
Rule
×2 + 1
Input
4
Output
9
Difficulty
medium

? → [-1] → 8

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Answer: 9

SubType
find-input
Rule
-1
Input
9
Output
8
Difficulty
medium

? → [×2 + 1] → 7

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Answer: 3

SubType
find-input
Rule
×2 + 1
Input
3
Output
7
Difficulty
medium

? → [×3] → 12

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Answer: 4

SubType
find-input
Rule
×3
Input
4
Output
12
Difficulty
medium

Input: 4 → [?] → 20, what is the rule?

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Answer: ×5

SubType
find-rule
Rule
×5
Input
4
Output
20
Difficulty
medium

Input: 1 → [?] → 11, what is the rule?

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Answer: +10

SubType
find-rule
Rule
+10
Input
1
Output
11
Difficulty
medium

Input: 2 → [×3] → ?

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Answer: 6

SubType
find-output
Rule
×3
Input
2
Output
6
Difficulty
medium

Input: 4 → [+5] → ?

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Answer: 9

SubType
find-output
Rule
+5
Input
4
Output
9
Difficulty
medium