casino players do observe previous round betting, but it depends on the game they are playing and their specific strategy. For example, in games like roulette or craps, players may use previous rounds or rolls to inform their betting strategy. They may look for patterns or trends in previous outcomes to make informed bets on the next round.In card games like blackjack, some players use card counting techniques to track the cards that have been played and adjust their bets accordingly. This strategy involves observing the outcomes of previous rounds to inform future betting decisions.