Question

7. A class room contains 20 boys and 10 girls. Another class room contains 15 boys and 15 girls
a chance of getting both being boys?
b. chance of getting both being girls?
c. chance of getting at least one boy?
d. chance of getting exactly one boy?
1
11​

Answer 1

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Total number of students in class 10 A= 20+20=40

Total number of students in 10 B= 25+15=40

Total no. Of outcomes= 40+40=80

P(both being girls)

=total number of girls in class A andB/total students

=20+25/80

=45/80

=9/16

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