Dennis buys a lottery ticket every saturday, using the same set of numbers. although he has only won $25 on one occasion, he keeps buying the tickets. in fact, he's a little afraid that if he doesn't buy a ticket, that would be the one that would win really big. the fact that dennis seems addicted to buying lottery tickets is a common characteristic of which schedule of reinforcement?
a) fixed ratio
b) fixed interval
c) variable ratio
d) variable interval

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.