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A probability density function is of the form
$\qquad p(x)=\mathrm{Ke}^{-\alpha|x|}, x \in(-\infty, \infty)$
The value of $\text{K}$ is

  1. $0.5$
  2. $1$
  3. $0.5 \alpha$
  4. $\alpha$
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