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Grade 12th passAlgebra

In question no. 12 and 13 i am having doubt plzz tell me how to approach for 12 question and 13

Question image for In question no. 12 and 13 i am having doubt plzz
Profile image of ravindra
8 Years agoGrade 12th pass
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1 Answer

Profile image of Anish Singhal
7 Years ago
For 13thtake det of A.A^t=64I and proceed.