# if two vectors whose direction ratios are 1,2,3 and -k,2,1 are perpendicular to each other then, a) k=7 b) k=4 c) k=3 o d) k=6 me especially since we had be 1 poir 82) i don't know why he turned friends for so long.?
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Category: science |
Author: Hedda Galya
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