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AP EAMCET · Maths · Vector Algebra

If \(\overline{\mathrm{a}}=\overline{\mathrm{i}}+p \overline{\mathrm{j}}-3 \overline{\mathrm{k}}, \overline{\mathrm{b}}=p \overline{\mathrm{i}}-3 \overline{\mathrm{j}}+\overline{\mathrm{k}}, \overline{\mathrm{c}}=-3 \overline{\mathrm{i}}+\overline{\mathrm{j}}+2 \overline{\mathrm{k}}\) are three vectors such that \(|\overline{\mathrm{a}} \times \overline{\mathrm{b}}|=|\overline{\mathrm{a}} \times \overline{\mathrm{c}}|\), then \(\mathrm{p}=\)

  1. A \(-2\)
  2. B \(-1\)
  3. C \(1\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(2\)

Step-by-step Solution

Detailed explanation

\(|\overline{\mathrm{a}} \times \overline{\mathrm{b}}|=|\overline{\mathrm{a}} \times \overline{\mathrm{c}}|\) implies \(\overline{\mathrm{a}} \times (\overline{\mathrm{b}} \mp \overline{\mathrm{c}}) = \overline{0}\), so \(\overline{\mathrm{a}}\) is parallel to…