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Three Dimensional Geometry

Quick practice

Question 1 of 5

If the planes \vec{r} \cdot(t \hat{i}-\hat{j}+\hat{k})=2  and \vec{r} \cdot(4 \hat{i}+\hat{t}-3 \hat{k})=5 are perpendicular ,then find the value of 7t.

A

 7 t=-7

B

 7 t=14

C

 7 t=7

D

 7 t=-21

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