Question

Kiran purchased 3 pencils, 2 notebooks and one pen for INR 41. From the same shop Manasa purchased 2 pencils, one notebook and 2 pens for INR 29, while Shreya purchased 3 pencils, 2 notebooks and 2 pens for INR 44. The above situation can be represented in matrix form as \( AX = B \). Then \( \text{adj}(A) \) is equal to

• A. 9
• B. -9
• C. -1
• D. 1

Hint:

For an \( n \times n \) matrix, \( |\text{adj}(A)| = |A|^{n-1} \).

Answer 1

The Correct Option is D