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In each paragraph 3 multiple choice questions have to be answered. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Let a, b and c be three real numbers satisfying :
If the point P (a,b,c), with reference to (E), lies on the plane 2x+y+z=1, then the value of 7a+b+c is