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Question

Question: <img src="https://cdn.pureessence.tech/canvas_416.png?top_left_x=600&top_left_y=0&width=300&height=4...

A

a

B

2 a

C

0

D

None of these

Answer

a

Explanation

Solution

Let a=xi+yj+zk\mathbf { a } = x \mathbf { i } + y \mathbf { j } + z \mathbf { k }. Then