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Question

a এর মান কত হলে

a \hat{i} - 2 \hat{j} + \hat{k}

2 a \hat{i} - a \hat{j} - 4 \hat{k}

ভেক্টরদ্বয় পরস্পর লম্ব হবে?

-2 অথবা 1

-2 অথবা -1

2 অথবা 1

1 অথবা 3

ANS : 1

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