Higher Secondary Question Paper Solution of Year 2019 Question No: B.1.(vii)

\(\overrightarrow a = \hat i + 3\hat j - \hat k \)  এবং \(\overrightarrow b = 2 \hat i + 6 \hat j + \lambda \hat k \) ভেক্টর দুটি সমান্তরাল হলে \(\lambda\) এর মান হবে

(a) 3 (b) -6 (c) -3 (d) -2

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