If A = [[1, 2], [0, 1]] and B = [[3, 1], [2, 4]], what is the product AB?
Correct answer: B. [[7, 9], [2, 4]]
- A. [[5, 9], [2, 4]]
- B. [[7, 9], [2, 4]]
- C. [[7, 6], [3, 4]]
- D. [[3, 9], [2, 5]]
Explanation
Each entry of AB is obtained by multiplying a row of A by a column of B. The first row becomes (1)(3) + (2)(2) = 7 and (1)(1) + (2)(4) = 9.
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