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Let A=" diag "[3,-5,7]" and "B=" diag "[...

Let `A=" diag "[3,-5,7]" and "B=" diag "[-1,2,4].` ltbr. Find (i) (A+B) (ii) (A-B) (iii) -5A (iv) (2A+3B).`

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The correct Answer is:
`[3,-4,26]`
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