 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2007/paper-2/section-a/5/a/solution

The matrix product of the transposed first vector with the second is their dot product:

a^{T} b = 1 \cdot 2 + 3 \cdot 1 = 5.

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