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Here are the solutions for the problems in the image:

26. **i.** (3,5)

27. \[A^{-1} = A - 2I\]

28. The determinant (rendit n) is:
   \[
   n! \quad \text{(for n = 2)}
   \]

29. The vector \( d \) is a linear combination of vectors \( a \), \( b \), and \( c \), hence it **is** represented.

30. **iii.** \( t = -1 \)

31. **iv.** \( a = 0 \)

32. **i.** \( D = 0 \) 

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### Tip:
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