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Indian Navy Pilot Matrices — practice questions

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If A is a 3×3 matrix and det(A) = 4, then det(adj A):For a 2x2 matrix A with det A = 0, the system Ax = 0 has:The product of a matrix $A$ of order $2\times 3$ and $B$ of order $3\times 4$ has order:By Cramer's rule, the value of x_1 in Ax = b (where A is non-singular) is: