Answer:
Intermittent
Explanation:
There are two types of schedules of reinforcement
Continuous: Where a behavior is rewarded after the required behavior is performed.
Intermittent: Where a behavior is rewarded but not every time that the behavior is done.
There are four types of Intermittent schedule of reinforcement
Fixed-Ratio (FR) Schedule.
Fixed Interval (FI) Schedule.
Variable-Ratio (VR) schedule.
Variable-Interval (VI) schedule.
Gambling falls into the category of Variable-Ratio (VR) schedule where the response is rewarded after unpredictable number of responses.
Hence gambling falls in to the category of Intermittent schedule of reinforcement.