Re: Discussion Problem_ (2)

Posted by duck on Apr 09, 2013; 4:24pm
URL: http://discussion-forum.276.s1.nabble.com/Discussion-Problem-2-tp7579991p7580013.html

@Maahi..

The number of ways in which you can select 2 months is 12C2.

Now, after selecting 2 months (say they are Jan and Feb), we want birthdays of six different persons to fall in exactly Jan and Feb.
Total number of ways in which birthdays of six persons can fall in Jan or Feb = 2^6.
(as each person has 2 options)
We know that there are 2 cases in which all birthdays will fall in exactly 1 month.
So, No. of favourable cases = 2^6 -2

Therefore, Probability= [12C2 (2^6 - 2)] / 12^6