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A wall is covered in graffiti numbers. The numbers 0 to 9 all look like numbers when rotated 180 degrees except for 3, 4, and 7. Between 00 and 99, numbers may be grouped into those that are still readable as numbers when rotated and those that are not. What is the difference between the sizes of these two groups?
Try looking at the numbers again.
There are 49 numbers that are still readable when rotated 180 degrees. The remaining 51 numbers are unreadable. Therefore the difference between the two groups is 2.
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