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CBSE Class 12 Mathematics 2026 Main Paper 65/1/3 · Q171 Marksvector_algebra

CBSE Class 12 Mathematics 2026 Main Paper 65/1/3 · Question 17 (Vector Algebra)

The value of p for which vectors î + 2ĵ + 3k̂ and 2î − p ĵ + k̂ are perpendicular to each other is

✅ Step-by-Step Solution

Final Answer: (C) 5/2
  1. Dot product = 1·2 + 2·(−p) + 3·1 = 2 − 2p + 3 = 5 − 2p.
  2. Set 5−2p=0 ⇒ p=5/2.

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All Questions in CBSE Class 12 Mathematics 2026 Main Paper 65/1/3

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