**Total No. Of Obs = 50**

**No. of Girls = 20**

**No. of Boys = 50 - 20 = 30**

**1. Favourable obs of getting CR as girl = 20**

Probability of getting a CR as girl = Favourable Obs/Total No.Of Obs

P(of getting CR a Girl) = 20/50

** ****P(of getting CR a Girl) = 2/5**

**2. Favourable obs of getting CR as boy = 30**

**Probability of getting a CR as boy = ****Favourable Obs/Total No.Of Obs**

** P(of Getting CR a Boy) = 30/50**

**P(of Getting CR a Boy) = 3/5**

** Alternative Method**

**Probability of getting a CR as boy = 1 - ****Probability of getting a CR as girl**

P(of Getting CR a Boy) = 1 - 2/5

P(of Getting CR a Boy) = (5 - 2)/5

**P****(of Getting CR a Boy) = 3/5**

**U can use this method as Vice-Versa too**