Consider the following:Let P (-2, 1, -5) & Q (4, -3, -1) be two points in a 3D space1. The direction ration of the line segment PQ are 2. The sum of the squares of direction cosines of the line segment PQ is unity.Which of the above statements is/are correct?

Consider the following:Let P (-2, 1, -5) & Q (4, -3, -1) be two points

1.	Consider the following:Let P (-2, 1, -5) & Q (4, -3, -1) be two points in a 3D space1. The direction ration of the line segment PQ are < 3, -2, 2>2. The sum of the squares of direction cosines of the line segment PQ is unity.Which of the above statements is/are correct?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	Neither 1 nor 2
Answer» D. Neither 1 nor 2

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Consider the following:Let P (-2, 1, -5) & Q (4, -3, -1) be two points in a 3D space1. The direction ration of the line segment PQ are < 3, -2, 2>2. The sum of the squares of direction cosines of the line segment PQ is unity.Which of the above statements is/are correct?

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