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Q.

The equation to the altitude of the triangle formed by (1, 1, 1), (1, 2, 3), (2, –1, 1) through (1, 1, 1) is

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a

r=i-j+k+ti+j+2k

b

r=i+j+k+ti-j-2k

c

r=i-j-k+ti+j-2k

d

r=i+j+k+ti-j+2k

answer is C.

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Detailed Solution

by verification BC=(1, -3, -2) and one by one option coff of t with dot product=0

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The equation to the altitude of the triangle formed by (1, 1, 1), (1, 2, 3), (2, –1, 1) through (1, 1, 1) is