Answer:
fixed-ratio; variable-ratio
Explanation:
The fixed ratio is a reinforcement method. Reinforcement is given in this method after a number of responses have been completed.
The number of responses expected continues to be constant.
A variable-ratio schedule is a reinforcement schedule where an unknown number of responses reinforce the response. This routine produces a reliable, high response rate.
Betting and casino activities are great examples of a payout dependent on a schedule for a variable ratio.