He is so intelligent that the he can solve any methematical problem.

He is so intelligent that he could win the quiz competition.

If it is given that the probability that A can solve the same problem is (3)/(5). The probability that B can solve the same problem is (2)/(3). The probability that at least one of A and B can solve a problem is

Given the probability that A can solve a problem is 2/3 and the probability that B can solve the same problem is 3/5. Find the probability that none of the two will be able to solve the problem.