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WBJEE · Maths · Vector Algebra

If the vectors \(\vec{\alpha}=\hat{\mathbf{i}}+a \hat{\mathbf{j}}+\mathbf{a}^{2} \hat{\mathbf{k}}, \vec{\beta}=\hat{\mathbf{i}}+b \hat{\mathbf{j}}+\mathbf{b}^{2} \hat{\mathbf{k}}\), and \(\vec{\gamma}=\hat{\mathbf{i}}+c \hat{\mathbf{j}}+c^{2} \hat{k}\) are three non-coplanar vectors and \(\left|\begin{array}{lll}\mathbf{a} & \mathbf{a}^{2} & 1+\mathrm{a}^{3} \\ \mathbf{b} & \mathbf{b}^{2} & 1+\mathrm{b}^{3} \\ \mathrm{c} & \mathrm{c}^{2} & 1+\mathrm{c}^{3}\end{array}\right|=0\),
then the value of abc is

  1. A 1
  2. B 0
  3. C \(-1\)
  4. D 2
Verified Solution

Answer & Solution

Correct Answer

(C) \(-1\)

Step-by-step Solution

Detailed explanation

Hint: \(\left|\begin{array}{lll}\mathrm{a} & \mathrm{a}^{2} & 1 \\ \mathrm{~b} & \mathrm{~b}^{2} & 1 \\ \mathrm{c} & \mathrm{c}^{2} & 1\end{array}\right|(1+\mathrm{abc})=0\) \(a b c=-1[\because \vec{\alpha}, \vec{\beta}, \vec{\gamma}\) are non-coplanar vector \(]\)