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Given [(4,2),(-1,1)]M = 6 I, where M is ...

Given `[(4,2),(-1,1)]`M = 6 I, where M is a matrix and I is the unit matrix or order `2xx2`.
(i) State the order of matrix M.

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The correct Answer is:
(i) `2xx2` (ii) `[(1, -2),(1, 4)]`
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