ভেক্টর রাশি-৩

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\(\vec{A}=\hat{i}+2\hat{j}-2\hat{k}\) এবং \(\vec{B}=2\hat{i}+\hat{j}+\hat{k}\) ভেক্টরদ্বয়ের সমান্তরাল একক ভেক্টর কোনটি?
\(\frac{3}{\sqrt{19}}\hat{i}+\frac{3}{\sqrt{19}}\hat{j}-\frac{1}{\sqrt{19}}\hat{k}\)
\(\frac{3}{9}\hat{i}+\frac{3}{9}\hat{j}-\frac{1}{9}\hat{k}\)
\(\frac{3}{19}\hat{i}+\frac{3}{19}\hat{j}-\frac{1}{19}\hat{k}\)
\(\frac{3}{6}\hat{i}+\frac{3}{6}\hat{j}-\frac{1}{6}\hat{k}\)
উপরের কোনোটিই নয়

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Ans: \(\frac{3}{\sqrt{19}}\hat{i}+\frac{3}{\sqrt{19}}\hat{j}-\frac{1}{\sqrt{19}}\hat{k}\)
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