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Assume that for every person the probab...

Assume that for every person the probability that he has exactly one child, exactly 2 children and exactly 3 children are `(1)/(4), (1)/(2) and (1)/(4)` respectively . The probability that a person will have 4 grand children can be expressed as `(p)/(q)` where p and q are relatively prime positive integers. Find the value of `5p-q`.

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