Determinants Questions (2072)

Let A and B be 3 x 3 real matrices such that A is symmetric matrix and B is skew-symmetric matrix. Then the system of linear equations (A^2 B^2 - B^2 A^2)X = 0, where X is a 3 x 1 column matrix of unknown variables and 0 is a 3 x 1 null matrix, has :
How many \(3 \times 3\) matrices \(M\) with entries from \(\{0, 1, 2\}\) are there, for which the sum of the diagonal entries of \(M^T M\) is 5?
If Δ = a1b1c1a2b2c2a3b3c3 and A1, B1, C1 denote the co-factors of a1, b1, c1 respectively, then the value of the determinant A1B1C1A2B2C2A3B3C3 is -
Given \(A = \begin{bmatrix} 1 & 0 & 0 \\ 1 & 1 & 0 \\ 1 & 1 & 1 \end{bmatrix}\), \(B = A^{20}\) Find the sum of elements of the first column of \(B\).
If Δ = a1b1c1a2b2c2a3b3c3 and A1, B1, C1 denote the co-factors of a1, b1, c1 respectively, then the value of the determinant A1B1C1A2B2C2A3B3C3 is -
If A = [aij]2x2 where aij = i+j, i≠ji2-2j, i=j, then A-1 is equal to -
Let <mfenced close="|
If α, β ≠ 0, and f(n) = α^n + β^n and <mfenced open="|
If \(\Delta_1 = \begin{vmatrix} x & b & b \\ a & x & b \\ a & a & x \end{vmatrix}\) and \(\Delta_2 = \begin{vmatrix} x & b \\ a & x \end{vmatrix}\) are the given determinants, then
Consider the following statements.Statement-1 : If $\begin{bmatrix} 3 & -2 \\ 3 & 0 \\ 2 & 4 \end{bmatrix} \begin{bmatrix} y & y \\ x & x \end{bmatrix} = \begin{bmatrix} 3 & 3 \\ 3y & 3y \\ 10 & 10 \end{bmatrix}$, then $2x + 3y = \lambda$.Statement-2 : Given that $\ell + 5 = p + 2m$, where $A$ is a square matrix of order $n$.$\ell$ = maximum number of distinct entries if $A$ is a triangular matrix.$m$ = maximum number of distinct entries if $A$ is a diagonal matrix.$p$ = minimum number of zeroes if $A$ is a triangular matrix.Statement-3 : Let $A$ be the set of all $3 \times 3$ skew symmetric matrices whose entries are either $-1, 0$ or $1$. If there are exactly three $0$'s, three $1$'s and three $(-1)$'s, then number of such matrices is equal to $\mu$.Then, which of the following options is/are correct?
Let A and B be two symmetric matrices of order 3.Statement-1 : A(BA) and (AB)A are symmetric matrices.Statement-2 : AB is symmetric matrix if matrix multiplication of A with B is commutative.
If 1, \(\omega\), \(\omega^2\) are the cube roots of unity, then \[\Delta = \begin{vmatrix} 1 & \omega^2 & \omega^{2n} \\ \omega^n & \omega^{2n} & 1 \\ \omega^{2n} & 1 & \omega^n \end{vmatrix}\] is equal to
Let A be a 3x3 matrix such that A2 = I. If the determinant of A is -1 and the trace of A is 0, then the eigenvalues of A are:
The number of real values λ, such that the system of linear equations2x - 3y + 5z = 9x + 3y - z = -183x - y + (λ2 - |λ|)z = 16has no solution, is :-
If \(A = \begin{bmatrix}a & b & c \\ c & a & b \\ b & c & a\end{bmatrix}\) and \(a, b, c\) are roots of the equation \(x^3 + x^2 - 4 = 0\) then \(AA^T\) is equal to
If a, b, c are in A.P. and α, β, γ are positive real numbers in G.P., then the equation x+ax2+logαkx+bx2+logβkx+cx2+logγk=0 :-
If x, y, z are distinct digits (0 ≤ x, y, z ≤ 9) & the minimum possible value of z9yxzy9x9zyx is λ, then λ83700 is (where 9x, 9y & 9z are two digits number)
If M = 5/23/2-3/21/2, then which of the following matrices is equal to M2022?
If \(y = \sin(mx)\), then the value of the determinant\[\Delta = \begin{vmatrix} \sin mx & m\cos mx & -m^2 \sin mx \\ -m^3 \cos mx & m^4 \sin mx & m^5 \cos mx \\ -m^6 \sin mx & -m^7 \cos mx & m^8 \sin mx \end{vmatrix}\]is
For which of the following ordered pairs (μ, δ), the system of linear equations x + 2y + 3z = 13x + 4y + 5z = μ4x + 4y + 4z = δis inconsistent?
If the system of linear equations\(x - 4y + 7z = g\)\(3y - 5z = h\)\(-2x + 5y - 9z = k\)is consistent, then:
If \(f'(x) = \begin{vmatrix} mx & mx-p & mx+p \\ n & n+p & n-p \\ mx+2n & mx+2n+p & mx+2n-p \end{vmatrix}\), then \(y = f(x)\) represents
Let A = $\begin{bmatrix} l-3 & a & b \\ c & 6 & d \\ e & f & 9-l \end{bmatrix}$, B = adj(A) and C = adj(B). If |A| = 5, then tr(C) is (where |X|, tr(X) & adj(X) denote determinant value, trace and adjoint of matrix X respectively) -
Let A + 2B = $\begin{bmatrix} 1 & 2 & 0 \\ 6 & -3 & 3 \\ -5 & 3 & 1 \end{bmatrix}$ and 2A - B = $\begin{bmatrix} 2 & -1 & 5 \\ 2 & -1 & 6 \\ 0 & 1 & 2 \end{bmatrix}$, then Tr(A) - Tr(B) has the value equal to
For a matrix $A = \begin{bmatrix} 1 & 2r-1 \\ 0 & 1 \end{bmatrix}$, the value of $\prod_{r=1}^{50} \begin{bmatrix} 1 & 2r-1 \\ 0 & 1 \end{bmatrix}$ is equal to -
Find the values of \(a\), \(b\), \(c\), and \(d\) from the equation: \[\begin{bmatrix} a-b & 2a+c \\ 2a-b & 3c+d \end{bmatrix} = \begin{bmatrix} -1 & 5 \\ 0 & 13 \end{bmatrix}\]
If Δ = a1b1c1a2b2c2a3b3c3 and A1, B1, C1 denote the co-factors of a1, b1, c1 respectively, then the value of the determinant A1B1C1A2B2C2A3B3C3 is -
If A = 100210321, then A20 + (AT)20 equals
The system of linear equations x + y + z = 6, x + 2y + 3z = 14 and 2x + 5y + pz = q have -
If \(A\) and \(B\) are two nonzero square matrices of the same order such that the product \(AB = O\), then
Let $P = \begin{pmatrix} 1 & 0 & 0 \\ 4 & 1 & 0 \\ 16 & 4 & 1 \end{pmatrix}$ and $I$ be the identity matrix of order 3. If $Q = [q_{ij}]$ is a matrix such that $P^{50} - Q = I$, then $\frac{q_{31} + q_{32}}{q_{21}}$ equals
If \(a_1, a_2, \ldots, a_n, \ldots\) form a G.P. and \(a_i > 0\), for all \(i \geq 1\), then \(\begin{vmatrix} \log a_n & \log a_{n+1} & \log a_{n+2} \\ \log a_{n+3} & \log a_{n+4} & \log a_{n+5} \\ \log a_{n+6} & \log a_{n+7} & \log a_{n+8} \end{vmatrix}\) is equal to
If A = 5!6!7!6!7!8!7!8!9!, then |adj(adj(2A))| is equal to :
Which of the following options is/are correct ?(A) Let $A = \begin{bmatrix} 1 & 3 \\ -2 & 2 \end{bmatrix}$, $B = \begin{bmatrix} 4 & -3 \\ 2 & 2 \end{bmatrix}$ and $C_r = \begin{bmatrix} r.3^r & 2^r \\ 0 & (r-1)3^r \end{bmatrix}$ be 3 given matrices. Then $\sum_{r=1}^{50} tr.((AB)^r C_r) = 3(49.3^{50} + 1)$.(B) Given $A = \begin{bmatrix} 2 & 1 \\ 2 & 1 \end{bmatrix}$; $B = \begin{bmatrix} 9 & 3 \\ 3 & 1 \end{bmatrix}$. $I$ is a unit matrix of order 2. If $AX = A$, then $X = \begin{bmatrix} a & b \\ 2-2a & 1-2b \end{bmatrix}$ for $a, b \in R$(C) Given $A = \begin{bmatrix} 2 & 1 \\ 2 & 1 \end{bmatrix}$; $B = \begin{bmatrix} 9 & 3 \\ 3 & 1 \end{bmatrix}$. $I$ is a unit matrix of order 2. If $XA = I$, then $X$ does not exist(D) Given $A = \begin{bmatrix} 2 & 1 \\ 2 & 1 \end{bmatrix}$; $B = \begin{bmatrix} 9 & 3 \\ 3 & 1 \end{bmatrix}$. $I$ is a unit matrix of order 2. If $XB = 0$ but $BX \neq 0$, then $X = \begin{bmatrix} a & -3a \\ c & -3c \end{bmatrix}$, $a, c \in R, 3a + c \neq 0; 3b + d \neq 0$
Let A be a 3x3 matrix such that A^2 = I. If A is not equal to I and A is not equal to -I, then which of the following is true?
If AX = B where A is 3 x 3 and X and B are 3 x 1 matrices then which of the following is correct ?(A) If |A| = 0 then AX = B has infinite solutions(B) If AX = B has infinite solutions then |A| = 0(C) If (adj(A))B = 0 and |A| != 0 then AX = B has unique solution(D) If (adj(A))B != 0 & |A| = 0 then AX = B has no solution
Let M and N be two 3 x 3 matrices such that MN = NM. Further, if M != N^2 and M^2 = N^4, then
If \(f(x) = \begin{vmatrix} x & a & a \\ a & x & a \\ a & a & x \end{vmatrix} = 0\), then
If \(A = \begin{bmatrix} 0 & x \\ y & 0 \end{bmatrix}\) and \(A^3 + A = O\), then sum of possible values of \(xy\) is
Let $D_1 = \begin{vmatrix} a & b & a+b \\ c & d & c+d \\ a & b & a-b \end{vmatrix}$ and $D_2 = \begin{vmatrix} a & c & a+c \\ b & d & b+d \\ a & c & a+b+c \end{vmatrix}$ then the value of $\frac{D_1}{D_2}$ where $b \neq 0$ and $ad \neq bc$, is
Let the determinant of a square matrix A of order m be m - n, where m and n satisfy 4m + n = 22 and 17m + 4n = 93. If det (n adj (adj (mA))) = 3a 5b 6c. Then a + b + c is equal to:
For positive numbers x, y and z, the numerical value of the determinant is -
If\[\begin{vmatrix} r & 2r-1 & 3r-2 \\ \dfrac{n}{2} & n-1 & a \\ \dfrac{1}{2}n(n-1) & (n-1)^2 & \dfrac{1}{2}(n-1)(3n+4) \end{vmatrix},\]then the value of \(\displaystyle\sum_{r=1}^{n-1} \Delta_r\)
Let \(\Delta_1 = \begin{vmatrix} y^5z^6(z^3-y^3) & x^4z^6(x^3-z^3) & x^4y^5(y^3-x^3) \\ y^2z^3(y^6-z^6) & xz^3(z^6-x^6) & xy^2(x^6-y^6) \\ y^2z^3(z^3-y^3) & xz^3(x^3-z^3) & xy^2(y^3-x^3) \end{vmatrix}\) and \(\Delta_2 = \begin{vmatrix} x & y^3 & z^3 \\ x^4 & y^5 & z^6 \\ x^7 & y^8 & z^9 \end{vmatrix}\). Then \(\Delta_1 \Delta_2\) is equal to
Let A be a square matrix of order 3 such that \(\text{adj. }(\text{adj. }(\text{adj. }A)) = \begin{bmatrix}16 & 0 & -24\\ 0 & 4 & 0\\ 0 & 12 & 4\end{bmatrix}\). Find \(|A|\).
Let A = 02y12xy-12x-y1, (x, y ∈ R, x ≠ y) for which A^T A = 3I_3 is :-
If \[\begin{vmatrix} x-4 & 2x & 2x \\ 2x & x-4 & 2x \\ 2x & 2x & x-4 \end{vmatrix} = (A + Bx)(x - A)^2,\] then the ordered pair \((A, B)\) is equal to
Let $R = \begin{bmatrix} x & 0 & 0 \\ 0 & y & 0 \\ 0 & 0 & z \end{bmatrix}$ be a non-zero $3 \times 3$ matrix, where $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right) \neq 0, \theta \in (0, 2\pi)$. For a square matrix $M$, let trace $(M)$ denote the sum of all the diagonal elements of $M$. Then, among the statements: (I) Trace $(R) = 0$ (II) If trace $(\text{adj}(\text{adj}(R))) = 0$, then $R$ has exactly one non-zero entry.
If S is the set of distinct values of 'b' for which the following system of linear equations x + y + z = 1 x + ay + z = 1 ax + by + z = 0 has no solution, then S is :
Let a determinant is given by A = abcpqrxyz and suppose A = 6. If B = p+xq+yr+za+xb+yc+za+pb+qc+r then