the number of adults in housing society is three times the number of children in the society, if there are 50 children in the society, find the total number of residents in the society ( including both children and adults.
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Answer:
Let the number of families with a single child = x
The number of families with two children = x
Therefore, the total number of children is the society = x + 2x = 3x
The number of children picked at random having a sibling will be:
ns = 2x
∴ The required probability will be:
Ps = 0.667
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