Ononot — Let W be the subspace of \mathbb{R}^4 defined by the span of

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Vectors & Spaceshard

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Let $W$ be the subspace of $\mathbb{R}^4$ defined by the span of $\{ (1, 2, 1, 0), (0, 1, 2, 1) \}$ . Which of the following vectors is in $W^\perp$ ?