Final answer:
To find the probability that both computers will be infected with a virus when Emily randomly turns on 2 of the 7 computers, we can use the formula for the probability of independent events: P(A and B) = P(A) × P(B).
Step-by-step explanation:
To determine the probability that both computers will be infected with a virus when Emily randomly turns on 2 of the 7 computers, we can use the formula for the probability of independent events: P(A and B) = P(A) × P(B). In this case, A represents the first computer being infected and B represents the second computer being infected. Since Emily randomly turns on the computers, the probability of each computer being infected is the same.
Therefore, the expression that could be used is:
P(A and B) = (2/7) × (1/6)