The probability that John solved a particular problem is 1/3 and the probability that James solved the same problem is 1/5, if they both attempt the problem, what is the probability that it will be solved by at least one of them?

Answer 1

Prob(John can't solve) = 2/3
prob(james can't solve = 4/5

prob = 1 - prob(both don't solve)
= .....