Regarding the Jumbo Cactpot

[Sove92]

Yes, the RNG is explicitly rigged to draw a different last number than you specifically have chosen the vast majority of the time. This all despite the fact that the jumbo cactpot number is the same for the whole server.

All jokes aside, if you pick a different last number for all three tickets, your chances to win the 4th prize is 30%. Given you can only play once a week, a 30% rate isn't that great as even on average, you could only be expected to win the 4th once a month, which is pretty much in line with my experience over many years.