MHT CET · Maths · Vector Algebra
The vectors \(\overline{\mathrm{p}}=\hat{\mathrm{i}}+a \hat{\mathrm{j}}+a^2 \hat{\mathrm{k}}, \overline{\mathrm{q}}=\hat{\mathrm{i}}+b \hat{\mathrm{j}}+b^2 \hat{\mathrm{k}}\) and \(\overline{\mathrm{r}}=\hat{\mathrm{i}}+c \hat{\mathrm{j}}+c^2 \hat{\mathrm{k}}\) are non-coplanar and
\(\left|\begin{array}{lll}
a & a^2 & 1+a^3 \\
b & b^2 & 1+b^3 \\
c & c^2 & 1+c^3
\end{array}\right|=0\)
then the value of \((a b c)\) is
- A 0
- B -1
- C 1
- D 2
Answer & Solution
Correct Answer
(B) -1
Step-by-step Solution
Detailed explanation
\( \left|\begin{array}{lll} a & a^2 & 1 \\ b & b^2 & 1 \\ c & c^2 & 1 \end{array}\right| + \left|\begin{array}{lll} a & a^2 & a^3 \\ b & b^2 & b^3 \\ c & c^2 & c^3 \end{array}\right|=0 \) \( \left|\begin{array}{lll} 1 & a & a^2 \\ 1 & b & b^2 \\ 1 & c & c^2 \end{array}\right| + abc \left|\begin{array}{lll} 1 & a & a^2 \\ 1 & b & b^2 \\ 1 & c & c^2 \end{array}\right|=0 \)
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