Question

Express each of the following using the summation notation:

a. [2X_{1} +2X_{2} +2X_{3}][5X_{1} +5X_{2} +5X3_{3}]

b. [A_{1 }+ A_{2} + A_{3} +A_{4}]^{2}[B_{1}^{2} + B_{2}^{2} + B_{3}^{2} + B_{4}^{2}]

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