There are three groups of children in a school i.e. A, B and C. In group A, there are (x + 2) girls and x boy. In group B, there are 2 boys and 2 girls, whereas in group C, there are 1 girl and 2 boys respectively. One child is selected at random from each group. Find the value of x, if the probability of selecting 1 girl and 2 boys is 3/8. Share your approach
Any approach?
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Please explain this ques. 12
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Please explain eg. 5.19
Logical reasoning
The average of 4 numbers is 25. And r numbers are added to 4 numbers and the average becomes 30. Find the value of r ?
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