find the value of p given that this straight line is perpendicular to the vector i+2j+pk

the position vectors of the points K and L are given by

OK=3i-2j+2k and OL=-i+j+3k

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if ur talking about st line KL

then its vector will be OK - OL

2i - 3j - k

for perpendicular dot product = 0

2-6-p=0 or p=-4

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