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If the point (2, α , β ) lies on the plane which passes through the points (3, 4, 2) and (7, 0, 6) and is perpendicular to the plane 2x – 5y = 15, then 2 α – 3 β is equal to

1. 12
2. 7
3. 17
4. 5

Correct answer: 7

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