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Question

a এর কি মানের জন্য

\vec{A} = 2 a \hat{i} + a \hat{j} - 4 \hat{k}

\vec{B} = a \hat{i} + 2 \hat{j} + \hat{k}

পরস্পর অভিলম্ব।

3 অথবা -1

1 অথবা -2

2 অথবা -3

2 অথবা -1

ANS : 2

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