Question: 2 7. Let A = 1 and B = 1 -2 1 . Find AB and the sizes of A, B, and AB. 1

2 7. Let A = 1 and B = 1 -2 1

2 7. Let A = 1 and B = 1 -2 1 . Find AB and the sizes of A, B, and AB. 1 -2 3 3 4

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