Question

The construction of a building may be delayed by a strike. Suppose that the

probability that there will be a strike is 0.70, the probability that the construction

will be completed on time if there is no strike is 0.90 and the probability that the

building will be completed on time if there is a strike is 0.40, what is the

probability that the construction will be completed on time.

Answer 1

I'm using an image please note where I have, in writing the statement for the required probability used "AND " and where "OR"