@mrentropy Sure -
That is, if I flip a coin 10 times, there’s a 0.09766% it’ll be all heads. 365 flips, I’m down to 1.331×10^-108% (a very very small number) that it’ll never come up tails.
However, if we’re dealing with a pick-three system, we have 1:1000 chance of winning, so the odds that any one number comes up is 1:1000—or on average once every three years. Except previous numbers can be drawn again, so it’s possible that your number won’t be drawn.
For instance… I ran three years of triple digit numbers through wolfram alpha (here—you’ll get different numbers than I did). 777 came up twice, 555 never came up.