You can spell Chebyshev, so you can google "Chebyshev inequality probability"

stands for the complement of .Also, I had another question. This one said P(A and B-) is 0.6. B- stands for B with a line over it. What does B with a line over it stand for?

Full Problem says:

P(A) is 0.8 and P(A and B-) is 0.6. What is P(A and B)? (Hint-try a Venn diagram)

So is the probability that the event occurs and event does not occur (as the hint says draw a Venn diagram)

CB