ভেক্টর রাশি-১

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\(\vec{A}=2\hat{i}+\hat{j}-3\hat{k}\) ও \(\vec{B}=4\hat{j}-\hat{k}\) ভেক্টরদ্বয়ের স্কেলার গুণফল কত ?
[সিঃ ২০১৫ ]

\(3\)
\(7\)
\(9\)
\(11\)
উপরের কোনোটিই নয়

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Ans: \(7\)
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