MCQ
यदि $\mathrm{a}=\overline{\mathrm{i}}+2 \overline{\mathrm{j}}+3 \overline{\mathrm{k}}$ और $\mathrm{b}=3 \mathrm{i}+2 \mathrm{j}+\mathrm{k}$ तो $\cos \theta=$
  • A
    $\frac{6}{7}$
  • $\frac{5}{7}$
  • C
    $\frac{4}{7}$
  • D
    $\frac{1}{2}$

Answer

Correct option: B.
$\frac{5}{7}$
(B)

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