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For the three vectors a=(2,−2,4)b=(0,8,4)c=(−20,−4,8),\begin{aligned} a &= (2, -2, 4) \\ b &= (0, 8, 4) \\ c &= (-20, -4, 8), \end{aligned}abc=(2,−2,4)=(0,8,4)=(−20,−4,8), what is the value of 4a+12b−3c? 4a + 12b - 3c? 4a+12b−3c?
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