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Assertion: x+y+z-15=0 is the equation of...

Assertion: `x+y+z-15=0` is the equation of a plane which passes through the midpoint of the line segment joining the points (2,3,4) and (6,7,8). Reason: The mid point (4,5,6) satisfies the equation of the plane. (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not the correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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