Question

In class 10 A , there are 24 boys and 25 girls. In class 10B , there are 20 boys and 20 girls. One student is selected from each class for an activity. What is the probability of both of them being girls ?

• A. $\frac{25}{98}$
• B. $\frac{24}{95}$
• C. $\frac{15}{23}$
• D. $\frac{21}{50}$

Answer 1

The correct option is A

$\frac{25}{98}$

Total Students in 10 A = 49
Number of boys = 24
Number of girls = 25

Total Students in 10 B = 40
Number of boys = 20
Number of girls = 20

Probability of both being girls $=\frac{25\times 20}{49\times 40}$

$=\frac{500}{1960}$

$=\frac{25}{98}$