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Let the triangle PQR be the image of the triangle with vertices (1,3), (3,1) and (2, 4) in the line x + 2y = 2. If the centroid of Δ PQR is the point ( α , β ), then 15( α – β ) is equal to :

1. 24
2. 19
3. 21
4. 22

Correct answer: 22

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