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Question 260003
JEE Mathematics · Easy

Vectors: Dot product MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Dot productEasyQuestion 260003

Question

If a⃗ = î + 2ĵ and b⃗ = 3î − ĵ, then a⃗ · b⃗ is:
  1. A
    1
    Correct
  2. B
    5
  3. C
    −1
  4. D
    3

Correct answer

1

Explanation

a⃗ · b⃗ = (1)(3) + (2)(−1) + (0)(0) = 3 − 2 = 1.

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