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Add 3p^2q^2 – 4pq + 5, – 10 p^2q^2, 15 +...

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`3p^2q^2 – 4pq + 5, – 10 p^2q^2, 15 + 9pq + 7p^2q^2`

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The correct Answer is:
`5pq+20`
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