Someone plz help me in finding the answer of qns no 9
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Step-by-step explanation:
^-1 is used to denote the inverse
XYX^-1 is given. If you observe carefully what is being asked is actually the inverse of given determinant.
(ABC)^-1 is given as C^-1 B^-1 A^-1
so in above case inverse of XYX^-1 is XY^-1 X^-1.
Hence the answer is the inverse of given determinant which will be -1/42 (since it's a triangular matrix and it's determinant is product of diagonal elements)
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