You may see the order of symbols on each wheel and calculate the odds of winning the same as counting cards.

Well, why is that pesky RNG generating random numbers? Whenever you press play, the program picks the latest "set" of numbers generated. Each number in the "set" is one of the symbols on the reels. If you have three reels, you get three numbers in the set. For this reason, when those virtual wheels spin, the RNG has already calculated where the reels will be going to stop.

It might be so convenient for you if you may see the result of one spin and after that calculate the odds of the next spin going throughout the same spinning sequence a given number of rotations to pick the next symbol on the reel. But, as in the real-world roulette table where the croupier picks up the ball and starts the wheel spinning again, there's no fixed sequence between quality online slot machine spins.