Deer ticks can be carriers of either Lyme disease or human granulocytic ehrlichiosis (HGE). Based on a recent study, suppose that of all ticks in a certain location carry Lyme disease, carry HGE, and of the ticks that carry at least one of these diseases in fact carry both of them. If a randomly selected tick is found to have carried HGE, what is the probability that the selected tick is also a carrier of Lyme disease?

There is a 100% probability that the selected tick is also a carrier of Lyme disease.

Step-by-step explanation:

The problem states that:

Of the ticks that carry at least one of these diseases in fact carry both of them.

So, if a tick carries one of these diseases, there is a 100% probability that is carries another.

What is the probability that the selected tick is also a carrier of Lyme disease?

There is a 100% probability that the selected tick is also a carrier of Lyme disease.