OMR stands for Optical Mark Reader.
Lottery Tickets are a form of input that an OMR uses to input data. The lottery ticket has little squares where you need to colour it in with a dark pen. This is so the reader can sense the dark square and convert them into the lottery numbers you have selected.
Advantages:
Good for imputing large amounts of data at a low cost.
Little instructions needed to fill in the lottery tickets.
Disadvantages:
Poorly marked tickets can cause errors.
Creased tickets can cause errors/
The lottery could run without it, but it would take much more time and this would mean winnings would be difficult to confirm and money would be recieved later.
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