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Which of the following statements are correct ?

(A) ∣A′∣=∣A∣|A'| = |A|, where A is the transpose of matrix A

(B) If A=[aij]3×3A = [a_{ij}]_{3 \times 3}, then ∣4A∣=64∣A∣|4A| = 64|A|

(C) ∣A∣=∣adj A∣n−1|A| = |\text{adj } A|^{n-1}, where n is the order of the matrix

(D) If A is an invertible matrix of order 2, then det⁡(A−1)\det(A^{-1}) is equal to 1det⁡(A)\frac{1}{\det(A)}

Choose the correct answer from the options given below :

Solution

✅ Correct Option: 1

(A) ∣A′∣=∣A∣|A'|=|A| is true. (B) For 3×33\times 3, ∣4A∣=43∣A∣=64∣A∣|4A|=4^3|A|=64|A|, true. (D) det⁡(A−1)=1/det⁡(A)\det(A^{-1})=1/\det(A), true.

(C) Correct relation is ∣adj A∣=∣A∣n−1|\text{adj}\,A|=|A|^{n-1}, not ∣A∣=∣adj A∣n−1|A|=|\text{adj}\,A|^{n-1}. False.

So (A), (B), (D) only.

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