3*[[1,2],[3,4]]

Let's calculate: 3×[[1, 2], [3, 4]]
ⅰ 3×[[1, 2], [3, 4]] = [[3×1, 3×2], [3×3, 3×4]]
[[3×1, 3×2], [3×3, 3×4]]
ⅰ 3×2 = 6■3×3 = 9■3×4 = 12
▶Result:   [[3, 6], [9, 12]]

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