Question: If a = (2, 3,1) and b = (1, 1,2), find |a|, a + b, 3a b, a b, a b and b a. What

If a = (2, 3,1) and b = (1, 1,2), find |a|, a + b, 3a b, a b, a b and b a. What is the angle between a and b?

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