Originally posted by northernladuk
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Assumption. Once a ticket is drawn it is not put back.
1st prize = 10/400
2nd prize = 10/399 (or 9/399 if you won the 1st)
3rd prize = 10/398 (or 8/398 if won both already)
To find the chances of winning anything, you OR them.
OR is a an addition, so it's 30/1197
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