Although it is not known if you have to buy 1, 10, or 100 scratch-off lottery tickets to get a winner, it is highly probable that if you just keep buying, eventually you will get a winner. in fact, maybe the very next ticket you buy will be a winner. buying scratch-off lottery tickets is reinforced according to which type of schedule?

variable-ratio schedule

Explanation:

According to my research on different types of reinforcement schedules, I can say that based on the information provided within the question the schedule being used is called a variable-ratio schedule. This is a schedule in which responses are reinforced after a completely random number of responses. This is the reason why this schedule is mostly seen in Gambling and Lottery drawings (like in this scenario).

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answer: d is correct