4.84 Successful bids.

Consolidated Builders has bid on two large construction projects. The company president believes that the probability of winning the first contract (event ) is 0.6, that the probability of winning the second (event ) is 0.5, and that the probability of winning both jobs (event { and }) is 0.3. What is the probability of the event { or } that Consolidated will win at least one of the jobs?