help with statistical probability

Question

In a class of 25 students, 17 have a cat and 7 have a dog. There are 5 students who have a cat and a dog. What is the probability that a student who has a cat also has a dog?

Answer 1

of 25, 17 have a cat 7 have a dog 5 have both

what is the chance if someone has a cat they also have a dog??

5/17 = number with both divided by number with a cat

Answer 2

17 students have a cat. 5 of those 17 also have a dog. So the probability that a student who has a cat also has a dog is 5/17, or approximately 29.4%

Answer 3

#of students with cat = 17, # with dog = 7, # with both =5

P(cat) = 17/25

What is the probability that a student who has a cat also has a dog?

Students who have cat = 17

Out of these 17, 5 also have a dog (these 5 have cat and dog)

So required probability = 5/17