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# Find the value of 'p' for which the vectors 3i+2j+9k and i-2pj+3k are parallel - CBSE (Commerce) Class 12 - Mathematics

ConceptBasic Concepts of Vector Algebra

#### Question

Find the value of 'p' for which the vectors 3hati+2hatj+9hatk and hati-2phatj+3hatk are parallel

#### Solution

We know that for two vectors to be parallel, there direction cosines should have the same ratios.

∴ 3/1=2/(−2p)=9/3

⇒  p=−1/3

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Solution Find the value of 'p' for which the vectors 3i+2j+9k and i-2pj+3k are parallel Concept: Basic Concepts of Vector Algebra.
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