\"\"

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Given m,n,p and q non zero positive intigerse \ \

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Write a number between \"\"in terms of m,n,p and q. \ \ Add \"\"

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\"\"

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\"\"                         (Add: \"\")

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Divide above term by 2 \ \

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\"\"

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\"\"                         (Divide: \"\") \ \ \"\"

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The nember is \"\".