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Question
Compute the following sums:
`[[2 1 3],[0 3 5],[-1 2 5]]`+ `[[1 -2 3],[2 6 1],[0 -3 1]]`
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Solution
`[[2 1 3],[0 3 5],[-1 2 5]]`+ `[[1 -2 3],[2 6 1],[0 -3 1]]`
`⇒ [[2+1 1-2 3+3],[0+2 3+6 5+1],[-1+0 2-3 5+1]]`
`⇒[[3 -1 6],[2 6],[-1 -1 6]]`
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