Easy, but tricky question
Level
pending
Solve this logic number sequence puzzle by the correct digit
8080 = 6
1357 = 0
2022 = 1
1999 = 3
6666 = ?
The answer is 4.
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1 solution
Count the number of holes within the 4-digit numbers. Each 6 has one, so 1 x 4 = 4.