CBSE Class 10 Answered
the probability that the girls of class 10 pass in mathematics is 6/7 and that in English is 2/7.if no girl fails in both subjects and there are 4 girls passing both,then the number of girls in the class is?
Asked by | 07 Feb, 2014, 07:59: AM
Expert Answer
Let the total number of girls be G.
No. of girls passing both = 4
Now, P(passing Maths) = P(M) = 6/7
Then, P(M') = 1 - 6/7 = 1/7 = P(failing Maths)
Also, P(passing Eng) = P(E) = 2/7
Then, P(E') = 1 - 2/7 = 5/7 = P(failing Eng)
No. of girls failing both = 0
P(Failing in both subjects) = 0 =
No. of girls failing in only one subject = G - 4
Thus,
Now, we have, by addition theorem,
Answered by | 07 Feb, 2014, 10:30: AM
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