∆ = | array ccc p & 2- i & i + l 2+ i & q & 3+ i 1- i & 3- i & r array | is always (where…
Mathematics · JEE Advanced · NTA Exams — Matrices and Determinants
∆ = \[\left|\begin{array}{ccc}
\mathrm{p} & 2-\mathrm{i} & \mathrm{i}+\mathrm{l} \\
2+\mathrm{i} & \mathrm{q} & 3+\mathrm{i} \\
1-\mathrm{i} & 3-\mathrm{i} & \mathrm{r}
\end{array}\right|\] is always (where p,q,r ∈ R)
- real
- imaginary
- zero
- none of these
Answer
(A) real
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