Question

Savita and Hamida are friends. What is the probability that both will have (i) different birthdays? (ii) the same birthday? (ignoring a leap year).

Answer 1

Since there are 365 days

(i) If Savita is born is any day and Hamida born on any day except on which Savita was born.

P(different birthdays) = 364/365

(ii) If Savita and Hamida have a same birthday, then it can be any 1 day of 365 days.

P(the same birthday) = 1/365