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a. | m-n | = |(2 0 1) - (1 1 2)| = |(1 -1 -1)|
| m-n | = √(1²+(-1)²+(-1)²) = √3
b. | m+n | = |(2 0 1) + (1 1 2)| = |(3 1 3)|
| m+n | = √(3²+1²+3²) = √19