Question

probability of birthday not on the same day

Answer 1

Generally a year contains 366 days
Favourable outcomes = 366 days - 1 day = 365
Total outcomes = 366
Probability = Favourable outcomes / Total outcomes
                = 365/366

If it is a leap year, it contains 365 days
Favourable outcomes = 365 days - 1 day = 364
Total outcomes = 365
Probability = Favourable outcomes / Total outcomes
                = 364/365

Answer 2

probability=chances/total.

leap year=366 days.
366-1=365

not leap year=roughly 365 days.
365-1=364.

Ans:If leap year⇒365/366      If not leap year⇒364/365