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Question:

The distance of the point having position vector −i^+2j^+6k^ from the straight line passing through the point (2,3,−4) and parallel to the vector 6i^+3j^−4k^ is:

7

43

6

213

Solution:

Correct option is A. 7
AD=|AP→.n→|/|n→|=6
PD=√(AP²-AD²)=√(110-6;1)=7