Question: c) A X (B X C) and (A X B) X C 4. Use the summation definition of scalar product (r . s = Er;s;)

c) A X (B X C) and (A X B) X C 4. Use the summation definition of scalar product (r . s = Er;s;) to show that the scalar product is distributive, that is, r . (a + b) = r . a+r . b

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