# Question

You plan to buy two stocks: A and B. You estimate that stock A has an 80% chance of increasing in value. You estimate that stock B has a 70% chance of increasing in value. You also estimate that if stock A increases in value, the chance that stock B will increase jumps to 75%.

a. What’s the probability that both stocks increase in value?

b. What’s the probability that at least one of the stocks—either A or B or both— will increase in value?

a. What’s the probability that both stocks increase in value?

b. What’s the probability that at least one of the stocks—either A or B or both— will increase in value?

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