What is the radius of convergence of the power series $\sum_{n = 0}^{\infty} \frac{x ^{n}}{3 ^{n}}$ ?

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What is the cross product $u \times v$ of vectors $u = ⟨ 1, 0, 0 ⟩$ and $v = ⟨ 0, 1, 0 ⟩$ ?
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If a random variable $X$ follows a normal distribution with mean $μ = 50$ and standard deviation $σ = 5$ , what percentage of data fal…
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