If a person is randomly selected, find the probability that his or her birthday is not in may.

Supposing 30 days in the month of May (which is not always same in every year), we have,

S = Sample Space

n (S) = total days in a year=365 days

n (E) = no of favourable events

= no of days in the month of May=30 days

Then the probability is of favourable events is,

P (E) = n (E) / n (S) = 30/365=6/73

Now, the probability that the birthday is not in May is,

P' (E) = 1-6/73=67/73 ANS!