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Q.

The length of the projection of the vector (1, -2, -1) on the vector joining the points (2, 2, -6)and (6, -2, 1) is

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a

49

b

59

c

79

d

29

answer is B.

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Detailed Solution

a=i-2j-k   b=4i-4j+7k projection=a.bb=4+8-716+16+49=59

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