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This, a little bit unusual, barcode is based on the binary system. It is
built in such a way that it consists of eight rectangles, each of which in
turn consists of four smaller rectangles. The position of the small
rectangle within the bigger one defines its relative “value”. The first
position is “worth” 2^0 or 1. The second position - 2^1 or 2. The third
position - 2^2 or 4. And, finally, the forth position - 2^3 or 8. The value
of each small rectangle is shown in the number row above the barcode.
If the small rectangle is shaded (black) then its value is used and it
contributes to the overall value of the respective big rectangle. The eight
digits below the barcode are in fact the values of the respective big
rectangles. Though the digits are not distributed below the rectangles
evenly, the first digit represents the value of the first rectangle, the
second - of the second one, and so on.
The digit which has to be restored represents the value of the seventh
rectangle. The value of this rectangle in turn consists of the values of
three small shaded rectangles - 1, 2 and 4. In makes 7 in total. Thus, the
destroyed digit is 7. |
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