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What is the value of b such that the scalar product of the vector i + j + k with the unit vector parallel to the sum of the vectors 2 i +4 j -5 k and b i +2 j +3 k is unity?

Options

  1. A-2
  2. B-1
  3. C0
  4. D1

Correct answer

D. 1

Step-by-step solution

The correct answer is option (D).

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