A point on a line has coordinates (p+1, p-3, 2 p) where p is any real number. What are the direction cosines of the line?

NDA 2019 Mathematics question

A point on a line has coordinates where p is any real number. What are the direction cosines of the line?

Answer: (A)

The point is , so the direction ratios are with

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Question ID VK-029107