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What is the value of for which the vectors i - j + k , 2 i + j - k , i - j + k , are coplanar?

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

A. 1

Step-by-step solution

aligned & x( i - j + k )+y(2 i + j - k )= i - j + k & (x+2 y) i+(-x+y) j +(x-y) k = i - j + k & x+2 y= & 3 y=0, x= & y=0, =1 aligned

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