Two person in the same room what is the probability of having their birthday in same day?

the site automatically remove the numbers from my answer its answer is "one divided by three sixty five"

 If A is the event that persons have birthday at the same day then A' be the event that they have not,

P(A') = (/)x(/) =/

then probability of birthday at the same day is

P(A) =1- P(A') =1 -/ =1/