If you think you can gain an advantage by way of sequential or conditional probability, try this two-way Roulette betting test on the 'even money' bets as follows:

First, bet with the outcome (defying probability), that is, if Black comes up bet Black. Keep betting Black until Red comes up then bet Red until Black comes up and so on. Bet every spin. Do the same with ODD/EVEN and HIGH/LOW, simultaneously.

You don't need to risk money. On your next visit to the Casino write a list of outcomes of say 50 or 100 spins of actual play at a Roulette table and try it out at home.

Then, using the same list, do the exact opposite. Bet against the outcome (supporting probability), that is, if Black comes up bet Red, if Red comes up bet Black. Bet every spin. Do the same with ODD/EVEN and HIGH/LOW, simultaneously.

Compare the two results.