Matrices

Bihar Board Class 12 · Mathematics · 84 past questions

13 of 84 · show all

1. Q3 2026 Set A2026 Set E2026 Set C2026 Set F2026 Set J2026 Set B

   If $A = \begin{bmatrix} 3 & -5 \\ -1 & 2 \end{bmatrix}$ then $\operatorname{adj} A =$

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2. Q8 2026 Set D

   If $A=\begin{bmatrix}3 & -5\\ -1 & 2\end{bmatrix}$ then $\text{adj}\,A =$

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3. Q10 2026 Set H

   If $A=\begin{bmatrix}3&-5\\-1&2\end{bmatrix}$ then $adj\,A =$

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4. Q17 2025

   If $A$ and $B$ are invertible matrices of same order then $(AB)^{-1} =$

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5. Q20 2025

   If $A = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$ then $A^{-1} =$

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6. Q22 2025

   Find the inverse matrix of the matrix $A = \begin{bmatrix}3 & 2\\5 & -1\end{bmatrix}$.

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7. Q33 2025 Set A

   The adjoint of the matrix $\begin{bmatrix}2&3\\5&4\end{bmatrix}$ is

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8. Q35 2025 Set E

   Adjoint matrix of matrix $\begin{bmatrix}2 & 3\\5 & 4\end{bmatrix}=$

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9. Q36 2024 Set D2024 Set J

   If $A=\begin{bmatrix}2&-3\\4&6\end{bmatrix}$ then $A^{-1}=$

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10. Q47 2024 Set J

    If $A = \begin{bmatrix} 3 & -5 \\ -1 & 2 \end{bmatrix}$ then adjoint $A =$

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11. Q53 20232023 Set E

    The adjoint matrix of matrix $\begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}$

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12. Q79 2016

    $\begin{vmatrix} 2 & 3 & 5 \\ 0 & 4 & 7 \\ 0 & 0 & 5 \end{vmatrix}$

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13. Q82 2015

    The inverse of $A=\begin{bmatrix}2&3\\5&k\end{bmatrix}$ will not be obtained if k has the value

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