Question

There are 60 students in a class among which 30 are boys. In another class, there are 50 students among which 25 of them are boys. If one from each class is selected, What is the probability of both being girls?

• A. $\frac{5}{4}$
• B. $\frac{1}{4}$
• C. $\frac{3}{4}$
• D. 1

Answer 1

The correct option is B

$\frac{1}{4}$

Total number of students in the first class = 60
No. of boys = 30
No. of girls = 30
Total number of students in the second class = 50
No. of boys = 25
No. of girls = 25

The probability of both being girls =$\frac{30\times 25}{60\times 50}$=$\frac{750}{3000}$=$\frac{1}{4}$