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What is the nature of the intersection of the set of planes `x+a y+(b+c)z+d=0,x+b y+(c+a)z+d=0a n dx+c y+(a+b)z+d=0?` (a). they meet at a point (b). they form a triangular prism (c). they pass through a line (d). they are at equal distance from the origin

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