If A = [[3, 1], [2, 4]] and B = [[1, 2], [0, 3]], find AB.
A[[3, 9], [2, 16]]CORRECT
B[[3, 9], [2, 14]]
C[[3, 7], [2, 16]]
D[[3, 7], [2, 14]]
GCEFurther MathematicsMatrices and Determinants2022
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Why the answer is A, and why the others tempt you.
Matrix multiplication: AB = [[(3×1+1×0), (3×2+1×3)], [(2×1+4×0), (2×2+4×3)]] = [[(3+0), (6+3)], [(2+0), (4+12)]] = [[3, 9], [2, 16]]. The distractors arise from errors in individual row-column dot products.
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