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Two vector vec(A)=2 hat(i) +3hat(j)-4hat...

Two vector `vec(A)=2 hat(i) +3hat(j)-4hat(k)` and `vec(B)=4hat(i) + 8hat(j) +x hat(k)` are such that the component of `vec(B) ` along `vec(A)` is zero . Then the value of x will be :

A

8

B

-4

C

4

D

-8

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The correct Answer is:
A
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