expert Set 42 Form Exercise

? → [+2] → 9

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Answer: 7

SubType
find-input
Rule
+2
Input
7
Output
9
Difficulty
expert

? → [×5] → 5

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Answer: 1

SubType
find-input
Rule
×5
Input
1
Output
5
Difficulty
expert

? → [×2 + 1] → 15

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Answer: 7

SubType
find-input
Rule
×2 + 1
Input
7
Output
15
Difficulty
expert

Input: 7 → [?] → 17, what is the rule?

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Answer: ×2 + 3

SubType
find-rule
Rule
×2 + 3
Input
7
Output
17
Difficulty
expert

Input: 10 → [?] → 28, what is the rule?

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Answer: ×3 - 2

SubType
find-rule
Rule
×3 - 2
Input
10
Output
28
Difficulty
expert

? → [×2 + 3] → 21

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Answer: 9

SubType
find-input
Rule
×2 + 3
Input
9
Output
21
Difficulty
expert

Input: 10 → [?] → 12, what is the rule?

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Answer: +2

SubType
find-rule
Rule
+2
Input
10
Output
12
Difficulty
expert

Input: 5 → [×2 + 3] → ?

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Answer: 13

SubType
find-output
Rule
×2 + 3
Input
5
Output
13
Difficulty
expert