A spinner is separated into 3 equal pieces, as shown below: A spinner is shown with three colors, red, yellow, and purple, marked on it. The arrow points towards the red color. Mary spins the spinner 6 times. What is the theoretical probability that it stops on the red sector on the last spin?

The chances of spinning on red is 1/3 all the time, because it's separated into 3 colors.
If he spins it six times, 6/20 is the chance he will spin red. Which that lowers to 1/3.