4. There are 25 boys and 15 girls in class 10 A. 15 boys and 20 girls in 10 B.
One student is to be selected from each class
a) What is the probability of both being boys?
b) What is the probability of both being girls?
c) What is the probability of one boy and one girl?
d) What is the probability of at least one girl?
(5)
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a) =Total number of students in both devisions : 25+15+15+20 =75
=Total number of boys in both devisions : 25+15=40
= Probability = 40/75= 8/15
b) = Total number of students = 75
=Total number of girls = 15+20= 35
= Probability = 35/75= 7/15
c) =Total number of students = 75
= number of one girl and one boy from both devisions = 4
= Probability = 4/75
d) = Total number of students = 75
= number of one girl from both devisions = 2
= Probability = 2/75
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