A Levels H2 math tuition - Vectors 2008/DHS/2/5

This question is from 2008/DHS/2/5. Part (iii) of the question needs you to understand that if three planes do not have a common point, then the line of intersection between two planes must be parallel to the third plane. Of course, all three planes must not be parallel in the first place.
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numberskill Math Tuition by Gary Ang provides JC H2 math tuition at A levels in Singapore.
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