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50 % has family  3 children ,30 % of family has 2 children  ,20 % of family has 1 children  .

Find probability P(child belongs to family of 2 children) ?

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total children = 50*3+30*2+20*1.=230

desired children =30*2 =60

probability P(child belongs to family of 2 children) = 60/230

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