expert Set 57 Form Exercise

? → [-1] → 3

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Answer: 4

SubType
find-input
Rule
-1
Input
4
Output
3
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: 2 → [×5] → ?

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Answer: 10

SubType
find-output
Rule
×5
Input
2
Output
10
Difficulty
expert

? → [×2 + 1] → 7

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Answer: 3

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

Input: 2 → [+5] → ?

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Answer: 7

SubType
find-output
Rule
+5
Input
2
Output
7
Difficulty
expert

Input: 10 → [×2 + 3] → ?

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Answer: 23

SubType
find-output
Rule
×2 + 3
Input
10
Output
23
Difficulty
expert

? → [+10] → 15

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Answer: 5

SubType
find-input
Rule
+10
Input
5
Output
15
Difficulty
expert

Input: 1 → [?] → 0, what is the rule?

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Answer: -1

SubType
find-rule
Rule
-1
Input
1
Output
0
Difficulty
expert