\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Identify the option(s) that cannot form a valid probability vector, and explain why.
  1. \(\begin{pmatrix} 0.5 & 0.5 \end{pmatrix}\)
  2. \(\begin{pmatrix} 0.2 & 0.9 \end{pmatrix}\)
  3. \(\begin{pmatrix} -0.1 & 1.1 \end{pmatrix}\)

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