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Question

If ABBC, then the value of k is if A(k,1,1), B(2k,0,2), C(2+2k,k,1)

A
3
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B
2
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C
2
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D
3
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Solution

The correct option is D 3
Given, A(k,1,1),B(2k,0,2),C(2+2k,k,1)
AB=(k,1,3)BC=(2,k,1)
AB is perpendicular to BC
So, AB.BC=0
2kk3=0
k=3

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