A small plane has crashed near a sea coast, and search is to be organized. The following table shows the probability that the plane crashed into the sea on into the land, and the conditional probability that if the plane has crashed into the sea or land, it will not be found.

(a) The initial search was in the sea, and the plane was not found. After that, what is the chance the plane is nevertheless crashed into the sea?

(b) The search was continued on the land, and still the plane was not found. After that, what is the chance that the plane crashed into the sea?

- Initial chance the plane is there Chance of being not found