Probability is defined as number of favorable outcomes divided by total number of events.
probability = [tex]\frac{number of favorable outcomes}{total number of events}[/tex]
Now as we have been given,
total number of cats= 2
total number of dogs = 4
so total number of animals (events) = 6
we have been asked the probability that 2 cats can be seen
so probability = [tex]\frac{2}{6}[/tex] = [tex]\frac{1}{3}[/tex]
Hence the answer is option A.
