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The directional derivative of $f(x,y,z) = xyz$ at point $(-1,1,3)$ in the direction of vector $\hat{i} – 2 \hat{j} +2 \hat{k}$ is

  1. $3\hat{i} – 3 \hat{j} - \hat{k} \\$
  2. $- \dfrac{7}{3} \\$
  3. $\dfrac{7}{3} \\ $
  4. $7$
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