The Nebraska Lottery has a lotto game called MyDay, in which you pick a month, day and 2-digit year (00-99) and if you match at least part of the date drawn, you win. Invalid dates are not allowed (e.g. 09/31) and leap days (02/29) are only allowed if the year is divisible by 4, including 00.
Here is their odds chart:
| Month+Day+Year | 1 in 36,525.00 |
| Day+Year | 1 in 3,320.00 |
| Month+Year | 1 in 1,240.00 |
| Month+Day | 1 in 369.00 |
| Year | 1 in 113.00 |
| Day | 1 in 34.00 |
| Month | 1 in 13.00 |
Is it me are these numbers totally screwed up?
There are 12 months in the year, so shouldn't the odds of picking a particular month be 1 in 12? And they only use a two digit year, so that should be odds of 1 in 100, right? Day odds are a bit trickier to calculate, 365.25 days in a year divided by 12 comes to 1 in 30.4375.
Month + Day should be 1 in 356.25, right? There are 100 years in the game, so Month + Year should be 1 in 1200. And Day + Year, another slightly tricky one, should be 1 in 3,043.75
They at least got the Month+Day+Year correct.
Is my math wrong, or theirs? How did they come up with their numbers?
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