8. In a school there are twelve classes. If each class has 28 boys and 22 girls,
find the number of students enrolled in the school.
Answers
Answered by
4
Answer:
there are total 600 students enrolled in school
Answered by
4
Answer:
Correct option is
A
145
22
Number of ways of selecting 2 students from 30 students = 30C2 ways
= ( 30 x 29 )/2
= 15 x 29 ways
Number of ways of selecting 2 girls from 12 girls = 12C2 ways
= 12 x 11 / 2
= 6 x 11
Thus, probability that both selected students are girls
= ( 6 x 11 ) / ( 15 x 29 )
= 22 / 145
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