If $a = \alpha \hat{i} + 3 \hat{j} - 6 \hat{k}$ and $b = 2 \hat{i} - \hat{j} + \beta \hat{k}$,then the values of $\alpha, \beta$ so that $a$ and $b$ may be collinear are

  • A
    $(-6, 2)$
  • B
    $(6, 2)$
  • C
    $(2, -6)$
  • D
    $(5, 3)$

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