Question

If the probability of two friends not having the same birthday is 0.975, what is

the probability that they have same birthday ?​

Answer 1

Given :-

If the probability of two friends not having the same birthday is 0.975

To Find :-

What is the probability that they have same birthday ?

Solution :-

Probability of having same birthday + Probability of not having same having same birthday = 1

Let the ​probability that they have same birthday be a

a + 0.975 = 1

a = 1 - 0.975

a = 0.025

Hence

Probability that they have same birthday is 0.025