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Questions  

The two vectors A=i^-3j^+yk^ and B=i^+2j^+xk^ are perpendicular. Find x y?

a
5
b
2
c
3
d
4

detailed solution

Correct option is A

A→.B→=AxBx+AyBy+AzBz =0when the vectors are perpendicular.A→.B→=1-6+xy=0⇒xy=5

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