 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2023/paper-2/17/c/i/solution

P

2 \cdot 1 - 1 (- 1) = 3

. The two-by-two inverse matrix formula yields

P^{- 1} = \frac{1}{3} (11 - 1 2) .

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