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Given vecalpha=3 hat i+ hat j+2 hat ka ...

Given ` vecalpha=3 hat i+ hat j+2 hat ka n d vecbeta= hat i-2 hat j-4 hat k` are the position vectors of the points `Aa n dBdot` Then the distance of the point `- hat i+ hat j+ hat k` from the plane passing through `B` and perpendicular to `A B` is a. `5` b. `10` c. `15` d. `20`

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