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In Q-2, if vectors are perpendicular to ...

In Q-2, if vectors are perpendicular to each other then find the value of `lambda`.

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If `vec(A)` and `vec(B)` are perpendicular to each other,then
`vec(A).vec(B)=orArra_(1)b_(1)+a_(2)b_(2)+a_(3)b_(3)=0`
So, `2(-4)+3(-6)+(-1)(lambda)=orArrlambda=-26`
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