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If the resultant of the vectors ( i + 2j - 3k), ( i - j + 2k) and vector C is a unit vector along the y­-direction, then vector C is

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If the resultant of the vectors ( i + 2j - 3k), ( i - j + 2k) and vector C is a unit vector along the y­-direction, then vector C is 

  1. - 2 i -­ k 
  2. - 2 i + k
  3. 2 i ­- k
  4. 2 i + k 
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1 Answer

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Best answer

Correct Answer: 1. - 2 i -­ k 

Explanation :

Equating components. 

2 + x = 0 

x = ­2 

1 + y = 1 

y = 0 

1 + z = 0

z = ­1 

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