Originally Posted by
guuchan
I heard the chance of winning 1st prize is 1 out of billions and of grand prize is trillions/etc.
Someone got her/his math wrong. Currently the chance of winning 1st prize is 1 out of 475,020; chance of winning grand prize is nearly non-calculatable as it involves a good number of possibilities, but it is very achievable (e.g. winning 3rd prize thrice). If you do manage to come up with a formulae for calculating the chance of winning grand prize, you are more than welcome to share it with us in the channel.