PLEASE help with statistical probability questions!

Question

In a class of 26 students, 14 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 chosen randomly from the class does not have a dog?

Answer 1

7+5 = 12 have a dog, so 26-12 = 14 do not have a dog

probability of randomly selecting a student who does not have a dog = 14/26 = 7/13 about 53.8%

that's interpreting the problem as saying 14 have only a cat and 7 only a dog, with 5 having both.

but if you meant the problem to say 14 have a cat and 7 have a dog, and of those 21 students 5 have a cat and a dog, then 19 out of 26 do Not have a dog for probability 19/26 = about 73.1%